阅读说明：本技术 一种航空复杂管路气密性的快速自动检测方法 (Rapid automatic detection method for air tightness of aviation complex pipeline ) 是由 骆彬 邓力川 张开富 程立鑫 许相杰 王青松 于 2021-04-07 设计创作，主要内容包括：本发明公开了一种航空复杂管路气密性的快速自动检测方法,所述方法应用于航空复杂管路气密性的快速自动检测系统,所述系统包括信号采集装置和控制装置；信号采集装置位于管路外部,信号采集装置用于在管路充压的状态下,检测管路外部的气流变化信号；控制装置和信号采集装置连接,控制信号用于接收气流变化信号,根据气流变化信号进行管路气密性检测。本发明通过检测管路外部的气流变化信号,省去刷检漏液的过程,减小每一处管接头检测等待时间,提高检测效率,并且无需清除检漏液,避免发生管接头被残留检漏液腐蚀的问题。(The invention discloses a rapid automatic detection method for the air tightness of an aviation complex pipeline, which is applied to a rapid automatic detection system for the air tightness of the aviation complex pipeline, wherein the system comprises a signal acquisition device and a control device; the signal acquisition device is positioned outside the pipeline and used for detecting airflow change signals outside the pipeline in a pipeline pressurization state; the control device is connected with the signal acquisition device, and the control signal is used for receiving the airflow change signal and detecting the air tightness of the pipeline according to the airflow change signal. According to the invention, through detecting the airflow change signal outside the pipeline, the process of detecting leakage liquid by brushing is omitted, the detection waiting time of each pipe joint is reduced, the detection efficiency is improved, the leakage liquid does not need to be cleared, and the problem that the pipe joints are corroded by residual leakage liquid is avoided.)

1. A rapid automatic detection method for air tightness of an aviation complex pipeline is characterized by being applied to a rapid automatic detection system for air tightness of an aviation complex pipeline, wherein the system comprises a signal acquisition device and a control device which are connected with each other; the signal acquisition device is positioned outside the pipeline and used for detecting airflow change signals outside the pipeline in a pipeline pressurization state; the method comprises the following steps:

the control device receives the airflow change signal transmitted by the signal acquisition device and outside the pipeline to be detected;

and the control device detects the air tightness of the pipeline according to the air flow change signal.

2. The method for rapidly and automatically detecting the airtightness of an aviation complex pipeline according to claim 1,

the signal acquisition device is an optical signal acquisition device;

the optical signal acquisition device is used for detecting the wavelength of an optical signal outside the pipeline in a pipeline pressurizing state;

and the control device is used for detecting the air tightness of the pipeline according to the wavelength change of the optical signal.

3. The method for rapidly and automatically detecting the airtightness of the aviation complex pipeline according to claim 2, wherein the optical signal acquisition device is a fabry-perot interferometer.

4. The method for rapidly and automatically detecting the airtightness of an aviation complex pipeline according to claim 1, wherein the system further comprises:

a gas delivery device;

the control end of the gas conveying device is connected with the control device, and the output end of the gas conveying device is connected with the pipeline; the control device is used for controlling the gas conveying device to convey gas with preset pressure to the pipeline.

5. The method for rapidly and automatically detecting the airtightness of an aviation complex pipeline according to claim 4, wherein the gas conveying device specifically comprises:

the device comprises a gas supply device, a pressure adjusting device and a pressure detecting device;

the input end of the pressure detection device is respectively connected with the gas supply device and the pressure adjusting device, the output end of the pressure detection device is connected with the control device, and the pressure detection device is used for detecting the pressure of compressed gas in the gas supply device and the gas pressure at the output end of the pressure adjusting device;

the input end of the pressure adjusting device is connected with the gas supply device, the output end of the pressure adjusting device is connected with the pipeline, and the control end of the pressure adjusting device is connected with the control device; the control device is used for controlling the pressure adjusting device to adjust the pressure of the compressed gas in the gas supply device; the control device is also used for controlling the pressure adjusting device to adjust the gas pressure at the output end of the pressure adjusting device.

6. The method for rapidly and automatically detecting the airtightness of the aviation complex pipeline according to claim 5, wherein the system further comprises:

a display device;

the display device is respectively connected with the control device and the pressure detection device; the display device is used for displaying the airflow change signal curve, the pressure of the compressed gas in the gas supply device and the gas pressure at the output end of the pressure adjusting device.

7. The method for rapidly and automatically detecting the airtightness of the aviation complex pipeline according to claim 6, wherein the system further comprises:

an alarm device;

the alarm device is respectively connected with the display device and the control device;

the alarm device is used for sending an alarm signal when the gas pressure value exceeds the measuring range and sending a pressure regulation stopping instruction to the control device;

and the control device controls the pressure adjusting device to stop running when receiving the pressure adjusting stopping instruction.

8. The method for rapidly and automatically detecting the airtightness of the aviation complex pipeline according to claim 7, wherein the control device performs the pipeline airtightness detection according to the airflow variation signal, and specifically comprises:

the control device receives the optical signal wavelength outside the pipeline to be detected transmitted by the optical signal acquisition device;

the control device judges whether the difference value between the wavelength of the optical signal and the preset wavelength is smaller than a preset difference value or not, and if the difference value is smaller than the preset difference value, the pipeline to be detected does not have a leakage point; otherwise, a leakage point exists in the pipeline to be detected; the preset wavelength is the wavelength of the optical signal detected by the optical signal acquisition device outside the pipeline without leakage.

Technical Field

The invention relates to the technical field of pipeline airtightness detection, in particular to a rapid automatic detection method for aviation complex pipeline airtightness.

Background

The pipeline airtightness detection system needs an experiment detection system with complete functions after the pipeline pavement is finished, and the airtightness detection system detects, inspects and maintains the airtightness performance of the pipeline, so that the pipeline can stably and reliably bear working condition pressure, and a sealing effect is achieved.

In the traditional pipeline air tightness detection method, leakage detection liquid is required to be coated at each gas pipe joint, and observation is carried out in a pressurized state to see whether bubbles are generated or not. When the leakage points are obvious, the observation time is short, but when the leakage points are inspected obviously, the observation time of the tiny leakage points is long, several minutes are long, and dozens of minutes are long, and the number of pipe joints is large, so that the inspection of each joint one by using a traditional method takes long, and the experiment progress is slowed down. In addition, when the test is finished, the worker needs to wipe off the residual leak detection liquid on the joint surface, which undoubtedly increases the workload. And the leakage detection liquid remained at the threaded connection part of the pipe joint cannot be completely removed, the threads can be corroded to cause irreversible influence on the connection strength of the pipe joint, and the safety of the service performance of a pipeline is seriously influenced.

Disclosure of Invention

The invention aims to provide a rapid automatic detection method for the air tightness of an aviation complex pipeline, which omits the process of leakage detection by brushing, reduces the detection waiting time of each pipe joint, improves the detection efficiency, does not need to remove the leakage detection liquid, and avoids the problem of corrosion of the residual leakage detection liquid of the pipe joints.

In order to achieve the purpose, the invention provides the following scheme:

a rapid automatic detection method for air tightness of an aviation complex pipeline is applied to a rapid automatic detection system for air tightness of an aviation complex pipeline, and the system comprises a signal acquisition device and a control device which are connected with each other; the signal acquisition device is positioned outside the pipeline and used for detecting airflow change signals outside the pipeline in a pipeline pressurization state; the method comprises the following steps:

the control device receives the airflow change signal transmitted by the signal acquisition device and outside the pipeline to be detected;

and the control device detects the air tightness of the pipeline according to the air flow change signal.

Alternatively,

the signal acquisition device is an optical signal acquisition device;

the optical signal acquisition device is used for detecting the wavelength of an optical signal outside the pipeline in a pipeline pressurizing state;

and the control device is used for detecting the air tightness of the pipeline according to the wavelength change of the optical signal.

Optionally, the optical signal collection means is a fabry-perot interferometer.

Optionally, the system further comprises:

a gas delivery device;

the control end of the gas conveying device is connected with the control device, and the output end of the gas conveying device is connected with the pipeline; the control device is used for controlling the gas conveying device to convey gas with preset pressure to the pipeline.

Optionally, the gas delivery device specifically comprises:

the device comprises a gas supply device, a pressure adjusting device and a pressure detecting device;

the input end of the pressure detection device is respectively connected with the gas supply device and the pressure adjusting device, the output end of the pressure detection device is connected with the control device, and the pressure detection device is used for detecting the pressure of compressed gas in the gas supply device and the gas pressure at the output end of the pressure adjusting device;

the input end of the pressure adjusting device is connected with the gas supply device, the output end of the pressure adjusting device is connected with the pipeline, and the control end of the pressure adjusting device is connected with the control device; the control device is used for controlling the pressure adjusting device to adjust the pressure of the compressed gas in the gas supply device; the control device is also used for controlling the pressure adjusting device to adjust the gas pressure at the output end of the pressure adjusting device.

Optionally, the system further comprises:

a display device;

the display device is respectively connected with the control device and the pressure detection device; the display device is used for displaying the airflow change signal curve, the pressure of the compressed gas in the gas supply device and the gas pressure at the output end of the pressure adjusting device.

Optionally, the system further comprises:

an alarm device;

the alarm device is respectively connected with the display device and the control device;

the alarm device is used for sending an alarm signal when the gas pressure value exceeds the measuring range and sending a pressure regulation stopping instruction to the control device;

and the control device controls the pressure adjusting device to stop running when receiving the pressure adjusting stopping instruction.

Optionally, the control device performs the pipeline airtightness detection according to the airflow variation signal, and specifically includes:

the control device receives the optical signal wavelength outside the pipeline to be detected transmitted by the optical signal acquisition device;

the control device judges whether the difference value between the wavelength of the optical signal and the preset wavelength is smaller than a preset difference value or not, and if the difference value is smaller than the preset difference value, the pipeline to be detected does not have a leakage point; otherwise, a leakage point exists in the pipeline to be detected; the preset wavelength is the wavelength of the optical signal detected by the optical signal acquisition device outside the pipeline without leakage.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a rapid automatic detection method for the air tightness of an aviation complex pipeline, which is applied to a rapid automatic detection system for the air tightness of the aviation complex pipeline, wherein the system comprises a signal acquisition device and a control device; the signal acquisition device is positioned outside the pipeline and used for detecting airflow change signals outside the pipeline in a pipeline pressurization state; the control device is connected with the signal acquisition device, and the control signal is used for receiving the airflow change signal and detecting the air tightness of the pipeline according to the airflow change signal. According to the invention, through detecting the airflow change signal outside the pipeline, the process of detecting leakage liquid by brushing is omitted, the detection waiting time of each pipe joint is reduced, the detection efficiency is improved, the leakage liquid does not need to be cleared, and the problem that the pipe joints are corroded by residual leakage liquid is avoided.

In addition, the signal acquisition device of the invention is an optical signal acquisition device; the control device receives the optical signal wavelength transmitted by the optical signal acquisition device and outside the pipeline to be detected, and determines that a leakage point exists in the pipeline to be detected when the difference value between the optical signal wavelength and the preset wavelength is larger than the preset difference value. The invention detects the gas leakage of the pipeline based on the principle that the difference of the medium density can influence the light propagation speed in the light propagation process and further change the wavelength, can more objectively judge the sealing effect of the pipe joint and solves the problem of poor stability of the detection result caused by human factors.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a structural diagram of a rapid automatic detection system for air tightness of an aviation complex pipeline in an embodiment of the invention;

FIG. 2 is a comparison graph of the time consumed for detection in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a rapid automatic detection method for the air tightness of an aviation complex pipeline, which omits the process of leakage detection by brushing, reduces the detection waiting time of each pipe joint, improves the detection efficiency, does not need to remove the leakage detection liquid, and avoids the problem of corrosion of the residual leakage detection liquid of the pipe joints.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Examples

The embodiment provides a method for quickly and automatically detecting the air tightness of an aviation complex pipeline, which is applied to a system for quickly and automatically detecting the air tightness of the aviation complex pipeline, and as shown in fig. 1, the system comprises: signal acquisition device 1, controlling means 2, gas delivery device, display device 3 and alarm device 4.

The signal acquisition device 1 is positioned outside the pipeline 8, and the signal acquisition device 1 is used for detecting airflow change signals outside the pipeline in a pipeline pressurizing state; the control device 2 is connected with the signal acquisition device 1, the control signal is used for receiving the airflow change signal, and the pipeline air tightness detection is carried out according to the airflow change signal. The control end of the gas conveying device is connected with the control device 2, and the output end of the gas conveying device is connected with the pipeline 8; the control device 2 is used to control the gas delivery device to deliver gas at a preset pressure into the line 8. The control device 2 is an upper computer.

Wherein, the signal acquisition device 1 is an optical signal acquisition device 1; the optical signal acquisition device 1 is used for detecting the wavelength of an optical signal outside a pipeline in a pipeline pressurizing state; the control device 2 is used for detecting the air tightness of the pipeline according to the wavelength change of the optical signal. The optical signal acquisition device 1 is a fabry-perot interferometer.

The control end of the gas conveying device is connected with the control device 2, and the output end of the gas conveying device is connected with the pipeline; the control device 2 is used for controlling the gas delivery device to deliver gas with preset pressure to the pipeline. The gas delivery device specifically includes: an air supply device 5, a pressure adjusting device 6 and a pressure detecting device 7. The input end of the pressure detection device 7 is respectively connected with the gas supply device 5 and the pressure adjusting device 6, the output end of the pressure detection device 7 is connected with the control device 2, and the pressure detection device 7 is used for detecting the pressure of compressed gas in the gas supply device 5 and the pressure of gas at the output end of the pressure adjusting device 6; the input end of the pressure adjusting device 6 is connected with the gas supply device 5, the output end of the pressure adjusting device 6 is connected with the pipeline, and the control end of the pressure adjusting device 6 is connected with the control device 2; the control device 2 is used for controlling the pressure adjusting device 6 to adjust the pressure of the compressed gas in the gas supply device 5; the control device 2 is also used for controlling the pressure adjusting device 6 to adjust the gas pressure at the output end of the pressure adjusting device 6. The pressure detection means 7 is a pressure sensor.

The display device 3 is respectively connected with the control device 2 and the pressure detection device 7; the display device 3 is used for displaying the airflow change signal curve, the pressure of the compressed gas in the gas supply device 5 and the gas pressure at the output end of the pressure adjusting device 6.

The alarm device 4 is respectively connected with the display device 3 and the control device 2; the alarm device 4 is used for sending an alarm signal when the gas pressure value exceeds the measuring range and sending a pressure adjustment stopping instruction to the control device 2; the control device 2 controls the pressure adjusting device 6 to stop operating when receiving the stop pressure adjustment command.

The rapid automatic detection method for the air tightness of the aviation complex pipeline comprises the following steps:

the method comprises the following steps: the control device 2 receives the airflow change signal transmitted by the signal acquisition device 1 and outside the pipeline to be detected.

Step two: and the control device 2 detects the air tightness of the pipeline according to the air flow change signal.

The second step specifically comprises the following steps:

the control device receives the wavelength of the optical signal outside the pipeline to be detected transmitted by the optical signal acquisition device; the control device judges whether the difference value between the wavelength of the optical signal and the preset wavelength is smaller than a preset difference value or not, and if the difference value is smaller than the preset difference value, the pipeline to be detected does not have a leakage point; otherwise, a leakage point exists in the pipeline to be detected; the preset wavelength is the wavelength of the optical signal detected by the optical signal acquisition device outside the pipeline without leakage.

The invention provides a rapid automatic detection method for the air tightness of an aviation complex pipeline in terms of the existing production mode, optimizes the assembly production process, improves the current situation that the traditional sealing detection link is slow in efficiency, simultaneously improves the stability of the detection effect, and further avoids the phenomena of oxygen system leakage, seepage and the like in the service process of an airplane to a higher degree, thereby ensuring that the oxygen system works safely and stably in the operation process of the airplane.

The detection process of the air tightness detection experiment system of the airplane oxygen pipeline pipe joint comprises the following steps:

the method comprises the following steps: the air tightness detection of the oxygen pipeline of the airplane needs to detect the leakage condition of compressed gas in the pipeline under the condition that the pipeline is filled with the compressed gas with specified pressure after the pressurizing and pressure maintaining process is finished; the pressure sensor detects a pressure signal provided by the gas source to the gas supply device, and the pressure signal is sent to the upper computer in a wireless transmission mode.

Step two: the upper computer receives the pressure signal of gas supply unit and compares with the pressure value that the experiment required to set for and calculates the pressure differential, starts pressure adjusting device and carries out pressure boost or step-down in order to reach the pressure value that the experiment required to the compressed gas of gas supply unit. Meanwhile, the pressure sensor monitors the pressure signal provided by the output end of the pressure adjusting device in real time and sends the pressure signal to the upper computer, and when the pressure signal reaches a specified pressure value, the upper computer controls the pressure adjusting device to stop running.

Step three: the pressure sensor monitors signals in real time and sends the signals to the air pressure display device in a wireless transmission mode, so that workers can conveniently check the air pressure display device. When the range set by the air pressure display device exceeds the range, the alarm device is triggered to alarm, and the pressure adjusting device stops running.

Step four: when the pipeline to be detected is flushed with compressed gas with the pressure intensity configured in the pressure filling and maintaining part, carrying out air tightness detection; the workers hold the portable signal acquisition device to perform sweeping detection along the oxygen pipeline, and the airflow change state signals are transmitted to the upper computer in real time in a wireless transmission mode to be processed and analyzed.

Step five: the upper computer analyzes the signal after receiving the signal of the signal acquisition device, judges whether the airtight state of the position is intact, if the acquired airflow state signal is stable, the sealing performance is good, if the phenomena of fluctuation, mutation and the like occur, the leakage point exists at the position, and the leakage degree of the leakage point can be judged according to the fluctuation; and meanwhile, the state judgment result is transmitted back to the signal acquisition device in a wireless transmission mode, so that the worker is guided to perform the next operation.

Step six: if the air tightness of the position is perfect, the next air tightness point is detected in sequence, otherwise, the point is maintained, and the point is detected again after the maintenance is perfect. When the test of oxygen pipeline of the same kind finishes, the workman will accomplish signal transmission and give the host computer through signal pickup assembly, and host computer control air feeder and pressure adjusting device stop the operation, carry out the detection of the sealed tube of the next way.

The method of the present invention is advantageous over conventional methods as shown in fig. 2. The traditional airtight detection method needs to smear leakage detection liquid at each oxygen pipe joint and observe the leakage detection liquid in a pressurized state to see whether bubbles are generated or not. When the leakage point is obvious, the observation time is short, but when the leakage point is inspected obviously, the observation time of the tiny leakage point is long, and is more than several minutes and dozens of minutes, and in addition, the number of the oxygen pipeline pipe joints is large, the conventional method can take long time for inspecting each joint one by one, and obviously slows down the experiment progress. The method of the invention omits the process of leakage detection, and utilizes the sensor of the hand-held signal acquisition device to quickly identify the flow field change near the joint so as to judge the sealing state of the pipe joint, thereby greatly reducing the waiting time of detection of each pipe joint and accelerating the detection efficiency.

In addition, when the test is finished, the worker needs to wipe off the residual leak detection liquid on the joint surface, which undoubtedly increases the workload. And the leakage detection liquid remained at the threaded connection part of the pipe joint cannot be completely removed, the threads can be corroded to cause irreversible influence on the connection strength of the pipe joint, and the safety of the service performance of the oxygen pipeline of the airplane is seriously influenced.

The following example shows that one pipeline to be tested has one pipe joint for analyzing the air tightness detection efficiency, wherein m obvious leakage points and (l-m) tiny leakage points are included. If the time for waiting for observing the leakage condition of the obvious leakage point is amin, the time for waiting for observing the leakage condition of the tiny leakage point is bmin, and the time cmin for cleaning the leakage detection liquid of each leakage point is set. The method of the invention adopts a signal acquisition device to acquire the flow field state near the pipe joint and judge the time for obvious leak points as a 'min, and judge the time for tiny leak points as b' min, wherein a 'is less than a, b' is less than b, and l is more than m.

The time consumed by the traditional method for detecting the air tightness of a pipeline with l pipe joints is alpha min, the time consumed by the method disclosed by the invention is beta min, and then:

α＝a×m+b(l-m)+c×l

β＝a′×m+b′(l-m)。

it is known that α - β ═ m (a-a ') + (l-m) (b-b') + cl > 0, and therefore the process of the present invention takes less time. The method of the invention has shorter test time, and the time saving delta is as follows:

if a is 1, b is 2, c is 0.8, a 'is 0.6, b' is 1.2, l is 6, and m is 2, Δ is 59.45%, it can be seen that the experimental efficiency of the air tightness detection is improved 59.45%, and the safety of the oxygen system is ensured.

The rapid automatic detection method for the air tightness of the aviation complex pipeline improves the positioning speed of a leakage point, avoids the phenomenon of residual corrosion of leakage detection liquid, and improves the stability of a detection result, thereby ensuring that the production rhythm is not slowed down due to the assembly problem of the air tightness detection link of an oxygen system in the assembly of the whole machine, and the leakage phenomenon is not generated due to the corrosion problem of a pipe fitting.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.