Inflation sealing automatic inflation and deflation system of transonic wind tunnel and control method

Abstract

The invention discloses an inflation sealing automatic inflation and deflation system of a transonic wind tunnel and a control method, relates to the field of wind tunnel tests, and solves the problem that a capsule is broken due to overhigh pressure or the wind tunnel leaks air due to insufficient pressure. The system takes a central control unit as a core, monitors the pressure of a wind tunnel plenum chamber, the pressure of a sealing capsule and the pressure of a vacuum buffer tank in real time through a pressure sensor, and dynamically controls a medium-pressure gas inlet pipeline to output eight-bar stable gas or a linkage vacuum system to start and stop a vacuum pump. When the pressure of the capsule is lower than a set lower limit, the central control unit drives the medium-pressure air inlet pipeline to be switched to the inflation passage through the electromagnetic valve group and the two-position three-way valve of the pipeline to start pressurization; and when the pressure exceeds the upper limit, the vacuum passage is switched to exhaust and depressurize, and the safety valve forcibly releases. The vacuum double pumps are automatically alternated according to eight-hour accumulative operation, and closed-loop control is formed by combining gas circuit switching. Dynamic balance of the sealing pressure in variable working conditions of the transonic wind tunnel is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of wind tunnel testing, and in particular to an automatic inflation and deflation system and a control method for an inflation seal of a transonic wind tunnel. Background Art

[0002] The wind tunnel inflation sealing system is an important component of the continuous transonic wind tunnel, which effectively ensures the good sealing of the wind tunnel and provides key guarantee for accurate measurement of wind tunnel tests.

[0003] In previous wind tunnel tests, the sealed capsule was filled with gas at a fixed pressure before the test. In the process of achieving continuously variable Mach numbers and pressures in a continuous transonic wind tunnel, the pressure differential between the inside and outside of the wind tunnel chamber changes rapidly, causing bidirectional displacement of multiple mechanisms, such as the chamber door and small doors. The inward displacement of the mechanism squeezes the sealed capsule, and excessive pressure in the capsule can cause problems such as capsule rupture. The outward displacement of the mechanism creates a gap between the capsule and the sealing surface, and insufficient pre-set pressure in the capsule can lead to air leaks in the wind tunnel. These problems seriously affect the normal progress of wind tunnel tests and reduce test efficiency. Summary of the Invention

[0004] To solve the problem of how to dynamically maintain the pressure of the sealing capsule to adapt to the change of the chamber pressure difference during the changing working conditions of a continuous transonic wind tunnel, and avoid the capsule rupture due to excessive pressure or the wind tunnel leakage due to insufficient pressure, the present invention provides an automatic inflation and deflation system for an inflatable seal of a transonic wind tunnel, comprising: a central control unit, a medium-pressure air inlet pipeline, a solenoid valve group and pipeline, a pressure sensor, and a vacuum system; The central control unit, as the core controller, obtains the wind tunnel chamber pressure, sealing capsule pressure and vacuum buffer tank pressure data in real time through the pressure sensor, and dynamically drives the medium pressure intake pipe output 8 Bar Stabilize the gas source or link the vacuum system to start and stop the vacuum pump, and switch the gas path through the solenoid valve group and pipelines. When the capsule pressure is insufficient, the central control unit instructs the medium-pressure air intake pipeline to inflate and increase the pressure through the solenoid valve group and pipeline; when the pressure is too high, the solenoid valve group and pipeline are switched to connect the vacuum system to pump air and reduce the pressure.

[0005] Furthermore, the central control unit includes: a human-machine operation interface, a data acquisition module, a data processing module, an automatic control module and an execution module;

[0006] The operating instructions of the human-machine interface are input into the data acquisition module. The collected raw data is filtered and converted by the data processing module and then transmitted to the automatic control module to generate a decision signal. Finally, the execution module outputs the control instructions. At the same time, the automatic control module and the human-machine interface exchange status information in real time.

[0007] Furthermore, the medium-pressure air intake pipeline includes: a medium-pressure air source, a medium-pressure pipeline, a filter and a pressure reducing valve;

[0008] The solenoid valve group and pipeline include: two-position three-way valve, solenoid valve and safety valve;

[0009] The pressure sensors include: an absolute pressure sensor for measuring the static pressure in the wind tunnel chamber, a gauge pressure sensor for measuring the real-time pressure of the gas in the sealed capsule, and an absolute pressure sensor for measuring the real-time pressure of the gas in the vacuum buffer tank;

[0010] The vacuum system includes: a first vacuum pump, a second vacuum pump and a vacuum buffer tank;

[0011] The medium-pressure gas source output end of the medium-pressure air inlet pipeline is connected to the filter and the pressure reducing valve in sequence through the medium-pressure pipeline, and the pressure reducing valve outlet is directly connected to the solenoid valve group and the air inlet end of the two-position three-way valve of the pipeline; the two-position three-way valve is connected in series with the solenoid valve and then connected to the gauge pressure sensor for measuring the real-time pressure of the gas in the sealed capsule, and then the safety valve is connected to release the pressure to the atmosphere; the first vacuum pump and the second vacuum pump of the vacuum system are connected in parallel and connected to the air inlet of the vacuum buffer tank together, and an absolute pressure sensor for measuring the real-time pressure of the gas in the vacuum buffer tank is installed on the top of the vacuum buffer tank and is reversely connected to the exhaust end of the two-position three-way valve through an independent pipeline, and the absolute pressure sensor for measuring the static pressure in the wind tunnel stagnation room is independently installed on the wind tunnel wall.

[0012] A method for controlling an automatic inflation and deflation system of an inflatable seal of a transonic wind tunnel is also provided, for controlling any of the above-mentioned systems, comprising:

[0013] S1. Synchronous acquisition of multi-source pressure, obtaining wind tunnel static pressure values through pressure sensors , capsule real-time pressure and tank pressure ;

[0014] S2. Dynamically control the capsule pressure and set the lower and upper pressure limits;

[0015] When the capsule real-time pressure is lower than the set pressure lower limit and lasts for 1 second, switch the two-position three-way valve to the medium-pressure air source path, open the solenoid valve to inflate until the capsule real-time pressure is greater than or equal to the set pressure upper limit minus ;

[0016] When the capsule real-time pressure is greater than the set pressure upper limit and lasts for 1 second, switch the two-position three-way valve to the vacuum buffer tank passage, open the solenoid valve to pump air until the capsule real-time pressure is less than or equal to the set pressure lower limit. ;

[0017] S3. Intelligent management of vacuum system, when the pressure inside the tank is greater than Start the first vacuum pump or the second vacuum pump;

[0018] When the pressure in the tank is less than The vacuum pump stops running when the vacuum pump runs out of time; the vacuum pump operation is completed by one vacuum pump. According to the accumulated running time of the two vacuum pumps, the priority start sequence is automatically switched. When one vacuum pump has run for a total of 8 hours, the other vacuum pump is automatically switched and the timing is started. At the same time, the timing of the vacuum pump that ran first is reset.

[0019] Beneficial effects of the present invention:

[0020] The present invention is applicable to various rapidly changing test conditions such as continuously changing Mach number and continuously changing pressure in a continuous transonic wind tunnel. It can realize rapid and automatic control of the gas pressure in the sealing capsule, effectively ensuring the sealing effect of the wind tunnel structure. The present invention uses the real-time calculation of the set pressure of the sealing capsule based on the static pressure of the wind tunnel resident chamber to intelligently adjust the gas pressure in the sealing capsule. This control method responds quickly to rapid pressure changes. At the same time, using the pressure range as the control target can filter out small fluctuations in pressure, reduce unnecessary adjustment actions, and effectively extend the service life of the control equipment and related valve groups. The above invention effectively reduces labor costs and equipment maintenance costs, improves test efficiency, and provides effective protection for the operation of continuous transonic wind tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a block diagram of an automatic inflation and deflation system for an inflation seal of a transonic wind tunnel according to the present invention; Figure 2 This is a schematic structural diagram of the central control unit of the present invention; Figure 3 Schematic diagram of the structure of the inflatable sealing system of the present invention; Figure 4 This is a flow chart of a method for automatically controlling the inflation and deflation of an inflation seal of a transonic wind tunnel according to the present invention; In the figure, 1 is the central control unit, 2 is the medium-pressure intake pipe, 3 is the solenoid valve group and pipe, 4 is the pressure sensor, and 5 is the vacuum system; 1-1 is the human-machine interface, 1-2 is the data acquisition module, 1-3 is the data processing module, 1-4 is the automatic control module, and 1-5 is the execution module; 2-1 is the medium-pressure gas source, 2-2 is the medium-pressure pipeline, 2-3 is the filter, and 2-4 is the pressure reducing valve; 3-1 is a two-position three-way valve, 3-2 is a solenoid valve, and 3-3 is a safety valve; 4-1 is an absolute pressure sensor for measuring the static pressure in the wind tunnel chamber, 4-2 is a gauge pressure sensor for measuring the real-time pressure of the gas in the sealed capsule, and 4-3 is an absolute pressure sensor for measuring the real-time pressure of the gas in the vacuum buffer tank; 5-1 is the first vacuum pump, 5-2 is the second vacuum pump, and 5-3 is the vacuum buffer tank. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below with reference to the embodiments, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be included in the scope of protection of the present invention. The process equipment or devices not specifically noted in the following examples are all conventional equipment or devices in the art. Unless otherwise specified, the raw materials used in the examples of the present invention can be obtained commercially; unless otherwise specified, the technical means used in the examples of the present invention are all conventional means well known to those skilled in the art.

[0023] Example 1, combined Figure 1 To illustrate this embodiment, an automatic inflation and deflation system for an inflatable seal of a transonic wind tunnel comprises: a central control unit 1, a medium-pressure air intake line 2, a solenoid valve group and line 3, a pressure sensor 4, and a vacuum system 5; The central control unit 1 is the core controller, which obtains the wind tunnel chamber pressure, the sealed capsule pressure and the vacuum buffer tank 5-3 pressure data in real time through the pressure sensor 4, and dynamically drives the medium pressure intake pipe 2 to output 8 Bar Stabilize the gas source or link the vacuum system 5 to start and stop the vacuum pump, and switch the gas path through the solenoid valve group and pipeline 3. When the capsule pressure is insufficient, the central control unit 1 instructs the medium-pressure air inlet pipeline 2 to be inflated and pressurized through the solenoid valve group and pipeline 3; when the pressure is too high, the solenoid valve group and pipeline 3 are switched to connect to the vacuum system 5 to evacuate and reduce the pressure.

[0024] The central control unit 1 includes: a human-machine operation interface 1-1, a data acquisition module 1-2, a data processing module 1-3, an automatic control module 1-4 and an execution module 1-5;

[0025] The operation instructions of the human-machine operation interface 1-1 are input into the data acquisition module 1-2. The collected raw data are filtered and converted by the data processing module 1-3 and then transmitted to the automatic control module 1-4 to generate a decision signal. Finally, the control instructions are output by the execution module 1-5. At the same time, the automatic control module 1-4 and the human-machine operation interface 1-1 exchange status information in real time.

[0026] Specific, combined Figure 2 It can be seen from the specific structure of the central control unit 1 that the human-machine interface communicates with the PLC based on the PROFINET protocol, and the data processing module and the automatic control module are software-controlled based on the PLC.

[0027] The medium-pressure air inlet pipeline 2 includes: a medium-pressure air source 2-1, a medium-pressure pipeline 2-2, a filter 2-3 and a pressure reducing valve 2-4;

[0028] The solenoid valve group and pipeline 3 include: a two-position three-way valve 3-1, a solenoid valve 3-2 and a safety valve 3-3;

[0029] The pressure sensor 4 includes: an absolute pressure sensor 4-1 for measuring the static pressure in the wind tunnel chamber, a gauge pressure sensor 4-2 for measuring the real-time pressure of the gas in the sealed capsule, and an absolute pressure sensor 4-3 for measuring the real-time pressure of the gas in the vacuum buffer tank; The vacuum system 5 includes: a first vacuum pump 5-1, a second vacuum pump 5-2 and a vacuum buffer tank 5-3; The output end of the medium-pressure gas source 2-1 of the medium-pressure air inlet pipeline 2 is connected to the filter 2-3 and the pressure reducing valve 2-4 in sequence through the medium-pressure pipeline 2-2. The outlet of the pressure reducing valve 2-4 is directly connected to the solenoid valve group and the air inlet end of the two-position three-way valve 3-1 of the pipeline 3; the two-position three-way valve 3-1 is connected in series with the solenoid valve 3-2 and then connected to the gauge pressure sensor 4-2 for measuring the real-time pressure of the gas in the sealed capsule, and then connected to the safety valve 3-3 to release the pressure to the atmosphere; the first vacuum pump 5-1 and the second vacuum pump 5-2 of the vacuum system 5 are connected in parallel and connected to the air inlet of the vacuum buffer tank 5-3. The absolute pressure sensor 4-3 for measuring the real-time pressure of the gas in the vacuum buffer tank is installed on the top of the vacuum buffer tank 5-3 and is reversely connected to the exhaust end of the two-position three-way valve 3-1 through an independent pipeline. The absolute pressure sensor 4-1 for measuring the static pressure in the wind tunnel resident room is independently installed on the wall of the wind tunnel.

[0030] Specific, combined Figure 3 The structural diagram of the inflatable sealing system of the present invention is shown in FIG. The medium-pressure gas source 2-1 has a pressure of 11-18 Bar, which is filtered by a filter and outputs a stable 8 Bar dry gas through a pressure reducing valve for use in the system; the upper limit pressure of the safety valve is 8 Bar;

[0031] The absolute pressure sensor 4-1 for measuring the static pressure in the wind tunnel has a range of 0-5 Bar , the gauge pressure sensor 4-2 that measures the real-time pressure of the gas in the sealed capsule has a range of 1-10 Bar The absolute pressure sensor 4-3 that measures the real-time pressure of the gas in the vacuum buffer tank has a range of 0-1 Bar ;

[0032] A method for controlling an automatic inflation and deflation system of an inflatable seal of a transonic wind tunnel is also provided, for controlling any of the above-mentioned systems, comprising:

[0033] S1. Multi-source pressure synchronous acquisition, obtain wind tunnel static pressure value, capsule real-time pressure and tank pressure through pressure sensor 4;

[0034] S2. Dynamically control the capsule pressure and set the lower and upper pressure limits;

[0035] When the capsule real-time pressure is lower than the set pressure lower limit and lasts for 1 second, switch the two-position three-way valve 3-1 to the medium pressure gas source 2-1 channel, open the solenoid valve 3-2 to inflate until the capsule real-time pressure is greater than or equal to the set pressure upper limit minus ;

[0036] When the capsule real-time pressure is greater than the set pressure upper limit and lasts for 1 second, switch the two-position three-way valve 3-1 to the vacuum buffer tank 5-3 passage, open the solenoid valve 3-2 to pump air until the capsule real-time pressure is less than or equal to the set pressure lower limit. ;

[0037] S3. Intelligent management of vacuum system, when the pressure inside the tank is greater than Start the first vacuum pump 5-1 or the second vacuum pump 5-2;

[0038] When the pressure in the tank is less than The vacuum pump stops running when the vacuum pump runs out of time; the vacuum pump operation is completed by one vacuum pump. According to the accumulated running time of the two vacuum pumps, the priority start sequence is automatically switched. When one vacuum pump has run for a total of 8 hours, it will automatically switch to the other vacuum pump and start timing, and the timing of the first running pump will be reset at the same time.

[0039] Specifically, the specific flow chart of the method of the present invention is as follows Figure 4 As shown, during the control process, the data acquisition module 1-2 is run, and the data acquisition module will collect the raw data of the resident chamber pressure sensor, the sealed capsule pressure sensor and the vacuum buffer tank 5-3 pressure sensor in real time, and feed the relevant data back to the data processing module; Run data processing modules 1-3 to perform range conversion and filtering on the raw data to obtain real-time pressure data, and feed the data back to the automatic control module; Run the automatic control modules 1-4 to calculate the real-time setting range of the pressure of each sealed capsule according to the static pressure data of the resident chamber, and use the pressure data of each sealed capsule to determine in real time whether the current pressure value in the sealed capsule is within the working pressure range. Based on the judgment result, automatically give the start and stop instructions of the vacuum pump; Run the automatic control module 1-4 to determine whether the real-time pressure value of the vacuum buffer tank 5-3 is higher than the preset pressure range, and automatically give an adjustment instruction based on the determination result and the current vacuum pump operation time; The execution module 1-5 is run to output instructions according to the S3 and S4 adjustment instructions to control the opening and closing of the two-position three-way valve 3-1 and the solenoid valve 3-2.

[0040] After the system starts running, the data of the two static pressure sensors are obtained. 、 and compared with the static pressure sensor value collected by the wind tunnel main control flow field Compare and determine whether the pressure sensor value is accurate:

[0041]

[0042]

[0043]

[0044] in is the data difference between the two static pressure sensors, is the average value of the two static pressure sensor data, The absolute difference between the average value of the two static pressure sensor data and the static pressure sensor value collected by the main control flow field is only satisfied if , while satisfying Under the condition of , it is determined that the two static pressure sensors are working normally.

[0045] Calculate the real-time setting range of pressure:

[0046]

[0047]

[0048] in, is the upper limit of the theoretical inflation condition of the sealed capsule under the current wind tunnel conditions, is the lower limit of the theoretical inflation condition of the sealed capsule under the current wind tunnel conditions, is the empirical value of the positive expansion of the sealing capsule inflation pressure according to the wind tunnel test conditions, It is the empirical value of negative contraction of the sealing capsule inflation pressure based on wind tunnel test conditions.

[0049] Determine the current pressure of the sealed capsule Is it within the restricted range — Inside:

[0050] like After the current pressure state lasts for 1s, the inflation command is issued, the two-position three-way valve is connected to the medium-pressure gas source pipeline, and the solenoid valve is opened to perform the inflation operation until -0.01Bar, stop issuing inflation commands, close the solenoid valve first, and then keep the position of the two-position three-way valve unchanged;

[0051] like , then maintain the current state unchanged and wait to enter the next control cycle;

[0052] like After the current pressure state lasts for 1s, a deflation command is issued, and the two-position three-way valve is connected to the 5-3 gas source pipeline of the vacuum buffer tank, and the solenoid valve is opened to perform the deflation operation until 0.01Bar, stop issuing the deflation command, close the solenoid valve first, then connect the two-position three-way valve to the medium-pressure air source pipeline and keep it unchanged.

[0053] After the system starts running, obtain the data of the vacuum buffer tank 5-3 pressure sensor ,when , the system gives the instruction to start the vacuum pump. , the system gives an instruction to stop the vacuum pump;

[0054] The vacuum pump operation is completed by one vacuum pump. The priority start sequence is automatically switched according to the accumulated running time of the two vacuum pumps. When one vacuum pump has been running for 8 hours, it will automatically switch to the other vacuum pump and start timing. At the same time, the timing of the vacuum pump that has been running first will be reset.

[0055] When a problem occurs in a running vacuum pump, the system will automatically switch the vacuum pump start control signal and cut out the faulty equipment after receiving the fault alarm signal to ensure that it is not activated again before the fault is repaired.

Claims

1. An automatic inflation and deflation system for an inflatable seal of a transonic wind tunnel, characterized in that: include: Central control unit (1), medium pressure air intake pipeline (2), solenoid valve group and pipeline (3), pressure sensor (4) and vacuum system (5); The central control unit (1) serves as the core controller. It obtains the wind tunnel chamber pressure, the sealed capsule pressure and the vacuum buffer tank (5-3) pressure data in real time through the pressure sensor (4). Based on this, it dynamically drives the medium-pressure air intake pipeline (2) to output a stable air source or links the vacuum system (5) to start and stop the vacuum pump, and switches the air path through the electromagnetic valve group and the pipeline (3). When the capsule pressure is insufficient, the central control unit (1) instructs the medium-pressure air intake pipeline (2) to be inflated and pressurized through the electromagnetic valve group and the pipeline (3); when the pressure is too high, the electromagnetic valve group and the pipeline (3) are switched to connect to the vacuum system (5) to evacuate and reduce the pressure.

2. The transonic wind tunnel inflatable seal automatic inflation and deflation system according to claim 1, characterized in that: The central control unit (1) comprises: a human-machine operation interface (1-1), a data acquisition module (1-2), a data processing module (1-3), an automatic control module (1-4) and an execution module (1-5); The operation instructions of the human-machine operation interface (1-1) are input into the data acquisition module (1-2). The collected raw data is filtered and converted by the data processing module (1-3) and then transmitted to the automatic control module (1-4) to generate a decision signal. Finally, the execution module (1-5) outputs the control instructions. At the same time, the automatic control module (1-4) and the human-machine operation interface (1-1) exchange status information in real time.

3. The transonic wind tunnel inflatable seal automatic inflation and deflation system according to claim 1, characterized in that: The medium-pressure air inlet pipeline (2) includes: a medium-pressure air source (2-1), a medium-pressure pipeline (2-2), a filter (2-3) and a pressure reducing valve (2-4); The solenoid valve group and pipeline (3) include: a two-position three-way valve (3-1), a solenoid valve (3-2) and a safety valve (3-3); The pressure sensor (4) includes: an absolute pressure sensor (4-1) for measuring the static pressure in the wind tunnel chamber, a gauge pressure sensor (4-2) for measuring the real-time pressure of the gas in the sealed capsule, and an absolute pressure sensor (4-3) for measuring the real-time pressure of the gas in the vacuum buffer tank; The vacuum system (5) includes: a first vacuum pump (5-1), a second vacuum pump (5-2) and a vacuum buffer tank (5-3); The output end of the medium-pressure gas source (2-1) of the medium-pressure air inlet pipeline (2) is connected to the filter (2-3) and the pressure reducing valve (2-4) in sequence through the medium-pressure pipeline (2-2), and the outlet of the pressure reducing valve (2-4) is directly connected to the electromagnetic valve group and the air inlet end of the two-position three-way valve (3-1) of the pipeline (3); the two-position three-way valve (3-1) is connected in series with the electromagnetic valve (3-2) and then connected to the gauge pressure sensor (4-2) for measuring the real-time pressure of the gas in the sealed capsule, and then connected to the safety valve (3-3) to release the pressure to the atmosphere; the first vacuum pump (5-1) and the second vacuum pump (5-2) of the vacuum system (5) are connected in parallel and then connected to the air inlet of the vacuum buffer tank (5-3), an absolute pressure sensor (4-3) for measuring the real-time pressure of the gas in the vacuum buffer tank is installed on the top of the vacuum buffer tank (5-3) and is reversely connected to the exhaust end of the two-position three-way valve (3-1) through an independent pipeline, and the absolute pressure sensor (4-1) for measuring the static pressure in the wind tunnel resident room is independently installed on the wind tunnel wall.

4. A method for controlling automatic inflation and deflation of an inflatable seal of a transonic wind tunnel, for controlling a system as claimed in any one of claims 1 to 3, characterized in that: include: S1. Multi-source pressure synchronous acquisition, obtain wind tunnel static pressure value through pressure sensor (4) , capsule real-time pressure and tank pressure ; S2. Dynamically control the capsule pressure and set the lower and upper pressure limits; When the capsule real-time pressure is less than the set pressure lower limit and lasts for 1 second, switch the two-position three-way valve (3-1) to the medium pressure gas source (2-1) path, open the solenoid valve (3-2) and inflate until the capsule real-time pressure is greater than or equal to the set pressure upper limit minus 1. ; When the capsule real-time pressure is greater than the set pressure upper limit and lasts for 1 second, switch the two-position three-way valve (3-1) to the vacuum buffer tank (5-3) and open the solenoid valve (3-2) to pump air until the capsule real-time pressure is less than or equal to the set pressure lower limit. ; S3. Intelligent management of vacuum system, when the pressure inside the tank is greater than When the first vacuum pump (5-1) or the second vacuum pump (5-2) is started; When the pressure in the tank is less than The vacuum pump stops running when the vacuum pump runs out of time; the vacuum pump operation is completed by one vacuum pump. According to the accumulated running time of the two vacuum pumps, the priority start sequence is automatically switched. When one vacuum pump has run for a total of 8 hours, the other vacuum pump is automatically switched and the timing is started. At the same time, the timing of the vacuum pump that ran first is reset.

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