CN111076873A - Leak detection method for aerostat bladder and aerostat bladder - Google Patents
Leak detection method for aerostat bladder and aerostat bladder Download PDFInfo
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- CN111076873A CN111076873A CN201811230586.5A CN201811230586A CN111076873A CN 111076873 A CN111076873 A CN 111076873A CN 201811230586 A CN201811230586 A CN 201811230586A CN 111076873 A CN111076873 A CN 111076873A
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- 238000001514 detection method Methods 0.000 title claims abstract description 119
- 239000002775 capsule Substances 0.000 claims abstract description 92
- 239000007789 gas Substances 0.000 claims description 75
- 238000003466 welding Methods 0.000 claims description 28
- 239000001307 helium Substances 0.000 claims description 21
- 229910052734 helium Inorganic materials 0.000 claims description 21
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 15
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 29
- 230000008569 process Effects 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000008439 repair process Effects 0.000 description 5
- 238000001819 mass spectrum Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 239000000344 soap Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64B—LIGHTER-THAN AIR AIRCRAFT
- B64B1/00—Lighter-than-air aircraft
- B64B1/58—Arrangements or construction of gas-bags; Filling arrangements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a leak detection method of an aerostat capsule and the aerostat capsule. The leak detection method comprises the following steps: step S10: injecting air into the aerostat air bag body, and injecting characteristic gas into the aerostat air bag body after the pressure value in the aerostat air bag body reaches a preset pressure value; step S20: after step S10, the concentration M of the characteristic gas in the preset environment in which the aerostat envelope is located is detected2(ii) a Step S30: detecting the concentration M of a characteristic gas at various regions of the outer surface of an aerostat envelope1(ii) a Step S40: by comparing the concentrations M2And concentration M1And determining the position of a leakage point of the aerostat capsule. By applying the technical scheme of the invention, the leak detection efficiency and the leak detection precision of the aerostat capsule can be improved, the air supply maintenance period of the aerostat is prolonged, and the use cost is reduced.
Description
Technical Field
The invention relates to the technical field of aerospace, in particular to a method for detecting a leak of an aerostat capsule and the aerostat capsule.
Background
The residence time of the aerostat is an important performance index of the aerostat, and the overall leakage rate of the aerostat capsule determines the length of the residence time, so that the leak detection of the aerostat capsule is an important means for calculating the overall leakage rate. At present, the detection of the leakage point of the aerostat capsule body comprises an observation method, an illumination method, a soap water method and the like.
1. And (3) an observation method: the air with a certain pressure is injected into the capsule body, and the air leakage condition is observed and checked through the artificial eyes. The advantages are that: is convenient and quick. The disadvantages are as follows: a tiny leak cannot be found.
2. And (3) an illumination method: the worker enters the capsule body, provides a light source at the outer side of the capsule body, judges the weak point (leak point) of the capsule skin by observing the local bright point of the capsule skin and then repairs the capsule skin. The advantages are that: the cost is low, and the operability is strong. The disadvantages are as follows: need operating personnel to get into the utricule inspection, operating personnel can produce to trample repeatedly and rub the utricule material, and then brings the secondary harm, and easy hourglass inspection.
3. A soap water method: and inflating the bag body, and immersing the suspicious surface into soapy water for observation. The advantages are that: the method is simple, can detect fine leakage points and is easy to realize. The disadvantages are as follows: the precision is low, soap bubbles with the radius of 1mm appear within 5min, the leakage rate is 5-10mbar.L/S, and the air tightness of the detected balloon cannot meet the application requirement.
Therefore, it is desirable to provide a new method for leak detection of an aerostat capsule to improve detection accuracy and detection efficiency.
Disclosure of Invention
The invention mainly aims to provide a method for detecting the leakage of an aerostat capsule and the aerostat capsule, and aims to solve the problems of poor precision and low efficiency of the method for detecting the leakage of the aerostat capsule in the prior art.
To achieve the above objects, according to one aspect of the present invention, there is provided an aerostat capsule inspection methodThe leakage detection method comprises the following steps: step S10: injecting air into the aerostat air bag body, and injecting characteristic gas into the aerostat air bag body after the pressure value in the aerostat air bag body reaches a preset pressure value; step S20: after step S10, the concentration M of the characteristic gas in the preset environment in which the aerostat envelope is located is detected2(ii) a Step S30: detecting the concentration M of a characteristic gas at various regions of the outer surface of an aerostat envelope1(ii) a Step S40: by comparing the concentrations M2And concentration M1And determining the position of a leakage point of the aerostat capsule.
Further, before step S10, the leak detection method further includes: step S01: detecting the concentration M of characteristic gas in a preset environment in which an aerostat envelope is located0(ii) a After step S20 and before step S30, the leak detection method further includes a determining step, where the determining step includes: judgment of concentration M2And concentration M0Whether the following formula is satisfied: m2-M0≦ 50ppm, if yes, perform step S30, if no, repeat step S20.
Further, before step S30, the method for leak detection further includes dividing a plurality of detection regions on an outer surface of the aerostat balloon.
Further, the aerostat capsule comprises a plurality of sequentially connected capsules, a welding seam is formed between every two adjacent capsules, the plurality of detection areas comprise a plurality of welding seams, and the step S30 comprises the step S31: detecting the concentration M of the characteristic gas at one of the plurality of welds by a mass spectrometer leak detector1。
Further, step S40 includes: step S41: judgment of concentration M1Whether or not it is greater than the concentration M2If yes, the step of marking the welding seam is executed; if not, detecting the concentration value M of the characteristic gas at the next welding seam in the plurality of welding seams2The step (2).
Further, after step S40, the leak detection method further includes: step S50: and judging whether the detection of the plurality of welding seams is finished, if so, executing the step of injecting the characteristic gas into the aerostat capsule again, and if not, executing the step of detecting the concentration value of the characteristic gas at the next welding seam in the plurality of welding seams.
Further, after step S50, the leak detection method further includes: step S60: detecting the concentration of characteristic gas at each mark on the aerostat capsule; step S70: the leak location is determined by comparing the concentration of the characteristic gas at each marker.
Further, the characteristic gas is helium.
Further, in step S10, the concentration of the characteristic gas injected into the aerostat envelope is 100ppm to 800 ppm.
Further, in step S50, the characteristic gas concentration injected into the aerostat capsule again is 1000ppm to 10000 ppm.
Further, the aerostat capsule has a preset sealing value, after the step S40, the leak detection method further includes a step of repairing the position of the leak point, and after the step of repairing, the leak detection method further includes a step of judging whether the actual sealing value of the aerostat capsule reaches the preset sealing value, if so, the detection of the aerostat capsule is finished, and if not, the steps S10, S20, S30 and S40 are repeatedly executed.
According to another aspect of the invention, an aerostat capsule is provided, leak detection is carried out by using the leak detection method, and detected leak points are repaired.
By applying the technical scheme of the invention, the concentration of the characteristic gas in the environment can be influenced after the characteristic gas in the aerostat capsule body leaks, so that whether a leak source exists in the aerostat capsule body can be detected by an instrument, and the position of the leak source can be further determined, so that a worker can conveniently repair the aerostat capsule body. Therefore, the leakage point position of the aerostat capsule is judged by detecting whether the characteristic gas leaks, a worker does not need to enter the capsule, secondary damage to the capsule in the detection process is avoided, and the detection efficiency is improved. Further, the leak detection method of this application can detect out the small leak source on the utricule, has improved the leak source rate of detection, and detection efficiency is higher, and operating personnel need not direct contact utricule in the testing process, can not rub or fold the utricule, avoids causing the damage or the leakage of utricule in the testing process. In addition, the method for detecting the leakage of the aerostat capsule is applied to detect the leakage of the aerostat capsule, so that the air supplementing maintenance period of the aerostat can be prolonged, and the use cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a flow chart of an embodiment of a method of leak detection of an aerostat bladder according to the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention provides a leak detection method for an aerostat capsule, as shown in figure 1. The leak detection method of the embodiment includes:
step S10: injecting air into the aerostat air bag body, and injecting characteristic gas into the aerostat air bag body after the pressure value in the aerostat air bag body reaches a preset pressure value;
step S20: after step S10, the concentration M of the characteristic gas in the preset environment in which the aerostat envelope is located is detected2；
Step S30: detecting the concentration M of a characteristic gas at various regions of the outer surface of an aerostat envelope1；
Step S40: by comparing the concentrations M2And concentration M1And determining the position of a leakage point of the aerostat capsule.
In this application, can influence the gaseous concentration of characteristic in the environment after the gaseous leakage of characteristic in the aerostatics utricule to can detect out the aerostatics utricule through the instrument and whether have the leak source, and then confirm the position of leak source, so that the staff repairs. Therefore, the leakage point position of the aerostat capsule is judged by detecting whether the characteristic gas leaks, a worker does not need to enter the capsule, secondary damage to the capsule in the detection process is avoided, and the detection efficiency is improved. Further, the leak detection method of this application can detect out the small leak source on the utricule, has improved the leak source rate of detection, and detection efficiency is higher, and operating personnel need not direct contact utricule in the testing process, can not rub or fold the utricule, avoids causing the damage or the leakage of utricule in the testing process. In addition, the method for detecting the leakage of the aerostat capsule is applied to detect the leakage of the aerostat capsule, so that the air supplementing maintenance period of the aerostat can be prolonged, and the use cost is reduced.
Preferably, the characteristic gas in this application is helium.
The helium gas has small molecular weight and viscosity coefficient, so the helium gas can easily pass through a leak hole of the helium mass spectrometer leak detector and can easily diffuse; in addition, helium is an inert gas and does not corrode equipment, so helium is taken as a characteristic gas in the present application.
Of course, in alternative embodiments of the invention not shown, other suitable gases may be selected as the characteristic gas, such as hydrogen.
The mass spectrum leak detection system used in the prior art comprises a mass spectrum leak detector, an exhaust fan, a gas collecting hood, a gas source, a pressure gauge, a valve and a plurality of pipelines. Air near the aerostat is extracted through the exhaust fan and is used for the mass spectrum leak detector to analyze, and redundant gas is exhausted through the exhaust valve. When suspicious leak points are detected, nitrogen is blown through the pores of the gas collecting hood by using the nitrogen, and then further detection is carried out. The above method has the following disadvantages: 1. helium is a rare gas and has a very low air content. The mass spectrum leak detection instrument can detect the content in the atmosphere with precision under the prior art, and an exhaust fan is not needed to increase the gas flow. 2. The leakage point is not properly determined by blowing nitrogen. Since blowing nitrogen will disturb the concentration gradient at the leak site due to helium diffusion, it is more difficult to find the leak site.
Compared with the prior art, the technical scheme of the application has the advantages that the detection structure is simpler, the operation is more convenient, the leakage points can be conveniently and accurately found, and the detection efficiency is high.
Specifically, in the embodiment of the present invention, before step S10, the leak detection method further includes:
step S01:detecting the concentration M of characteristic gas in a preset environment in which an aerostat envelope is located0；
After step S20 and before step S30, the leak detection method further includes a determining step, where the determining step includes:
judgment of concentration M2And concentration M0Whether the following formula is satisfied: m2-M0≦ 50ppm, if yes, perform step S30, if no, repeat step S20.
The aerostat envelope has a large volume, so that the aerostat envelope is easy to float after being inflated, and the leak detection work is inconvenient to carry out; if the aerostat envelope is fixed, the leakage point is easy to be pulled, and the leakage area is enlarged. Therefore, the predetermined environment in the present application is an indoor environment in which the air flow condition is good. After the aerostat envelope is inflated, the inflation inlet needs to be manually closed, so that partial leakage of characteristic gas is easily caused, the concentration of the characteristic gas in the environment is increased, and the leak detection precision is influenced.
Preferably, the concentration of helium (characteristic gas) injected into the aerostat capsule in step S10 in the present application is 100ppm to 800 ppm. Because the helium concentration in the atmosphere is about 5ppm, the concentration of the filling characteristic gas is between 100ppm and 800ppm, so that the difference between the helium concentration in the aerostat capsule and the helium concentration in the atmosphere is large, whether the aerostat capsule leaks can be clearly displayed, helium waste is avoided, and the cost is saved.
Before step S10, the concentration M of the characteristic gas in the preset environment is detected0After the air and the characteristic gas are filled into the aerostat air bag body, the air filling port is closed, and the concentration M of the characteristic gas in the preset environment is detected again2If M is present2-M0And if the concentration is less than or equal to 50ppm, the concentration of the characteristic gas in the preset environment meets the leak detection requirement, the leak detection result is not influenced, and the next leak detection work can be carried out. If M is2-M0If the concentration of the characteristic gas in the preset environment is higher than 50ppm, the characteristic gas is leaked when the gas filling port is closed, and the influence on the concentration of the characteristic gas in the preset environment is larger. At this time, it is necessary to ensure the ventilation of the preset environment, and the step S20 is repeatedly performed to continuously monitorPresetting the concentration M of characteristic gas in the environment2Constantly comparing M2-M0Whether or not less than 50ppm up to M2-M0And after the concentration is less than or equal to 50ppm, executing a subsequent leak detection method.
Preferably, prior to step S30, the method of leak detection includes dividing a plurality of detection regions on an exterior surface of the aerostat bladder.
Because the aerostat envelope is large in volume, before the step S30, the aerostat envelope is divided into a plurality of detection regions, and the leak detection operation is performed in the regions. The leakage detection device is convenient for operators to carry out leakage detection in order, avoids leakage detection or recheck, and improves leakage detection efficiency.
Further, in an embodiment of the present invention, the aerostat balloon comprises a plurality of sequentially connected flaps, each adjacent flap having a weld therebetween, the plurality of detection regions comprise a plurality of welds, and the step S30 comprises the step S31: detecting the concentration M of the characteristic gas at one of the plurality of welds by a mass spectrometer leak detector1。
In the method, a detection area is selected for leak detection, each detection area comprises a plurality of welding lines, and the welding lines in the detection area are detected in sequence by a helium mass spectrometer leak detector. Specifically, the mass spectrometer leak detector is close to the outer surface of an aerostat capsule, continuously moves to collect gas, and records the concentration M of characteristic gas in the collected gas1。
Preferably, the mass spectrometer in the present application is a helium mass spectrometer leak detector.
Further, step S40 includes:
step S41: judgment of concentration M1Whether or not it is greater than the concentration M2If yes, the step of marking the welding seam is executed; if not, detecting the concentration value M of the characteristic gas at the next welding seam in the plurality of welding seams2The step (2).
Concentration M of characteristic gas on the surface of aerostat capsule1And the concentration M of the characteristic gas in the preset environment2Making a comparison if the concentration M1Greater than the concentration M2Indicate floating in the airThe surface of the aerostat balloon has leak points, and the concentration of the characteristic gas at the surface of the aerostat balloon is increased due to the gas exposed in the aerostat balloon. At the moment, the welding seam is marked so as to facilitate the subsequent confirmation of the missing point. Of course, if the missing point is large, the missing point can be clearly seen by naked eyes, and the position can be directly marked as the missing point, so that the subsequent repairing work is facilitated. If the concentration M is1Not more than concentration M2And then, the sealing at the welding seam is good, and the detection of the next welding seam can be carried out.
As shown in fig. 1, in the embodiment of the present invention, after step S40, the leak detection method further includes:
step S50: and judging whether the detection of the plurality of welding seams is finished, if so, executing the step of injecting the characteristic gas into the aerostat capsule again, and if not, repeatedly executing the step of detecting the concentration value of the characteristic gas at the next welding seam in the plurality of welding seams.
After the welding seams are detected one by one, whether the welding seams in the detection area are completely detected is judged to ensure that detection omission does not occur.
Optionally, in the detection area of this application, except that need go on leak hunting to each welding seam, still need go on leak hunting to the fold department on utricule surface. Because the volume of aerostatics utricule is great, need fold when accomodating, fold department after folding many times forms the fold easily, and the intensity of utricule itself weakens, appears the leak source easily. Therefore, in the detection process, the welding seams and folds of the detection area are detected one by one, and the leakage detection is ensured to be complete by taking the condition of no leakage.
Further, after step S50, the leak detection method further includes:
step S60: detecting the concentration of characteristic gas at each mark on the aerostat capsule;
step S70: the leak location is determined by comparing the concentration of the characteristic gas at each marker.
After the leakage area on the aerostat capsule is marked, some areas with obvious leakage can be directly repaired, some leakage points are small, specific positions are difficult to determine, and the leakage points need to be further determined. At the moment, helium is injected into the aerostat capsule again, so that the helium concentration in the aerostat capsule reaches 1000ppm to 10000ppm, and the leakage of a leakage point is more obvious.
And sequentially detecting the marked part by adopting a helium mass spectrometer leak detector, so that a gun suction port of the leak detector moves at the marked part, and acquiring the maximum helium concentration part at the marked part, namely the leak point position.
The leakage detection method is more accurate in leakage detection and improves leakage detection precision.
Further, the aerostat capsule has a preset sealing value, after the step S40, the leak detection method further includes a step of repairing the position of the leak point, and after the step of repairing, the leak detection method further includes a step of judging whether the actual sealing value of the aerostat capsule reaches the preset sealing value, if so, the detection of the aerostat capsule is finished, and if not, the steps S10, S20, S30 and S40 are repeatedly executed.
After carrying out leak hunting operation once, repair the leak source that detects to test the sealed effect of aerostatics utricule, and judge whether the aerostatics utricule after repairing satisfies the requirement of leakproofness. If the requirement of the sealing performance is met, namely the sealing value reaches the preset sealing value, the leakage rate of the aerostat capsule body can meet the requirement of the dwell time of the aerostat, and the leakage detection can be finished at the moment. If the sealing value of the aerostat capsule does not reach the preset sealing value, the leakage rate of the aerostat capsule cannot meet the requirement of the residence time of the aerostat, the leakage point of the aerostat capsule needs to be continuously detected, and the leakage point is repaired, so that the leakage rate of the aerostat capsule can meet the requirement of the residence time of the aerostat.
The embodiment of the invention also provides an aerostat capsule body, which is used for detecting leakage by adopting the leakage detection method and repairing detected leakage points.
The leak detection method has the advantages of high leak detection efficiency and high leak detection precision. By the aid of the leak detection method, the air supply maintenance period of the aerostat can be prolonged, and use cost is reduced. Therefore, the aerostat capsule for leak detection by the leak detection method also has the advantages.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: because the concentration of characteristic gas in the environment can be influenced after the characteristic gas in the aerostatics utricule leaks to whether there is the leak source in the aerostatics utricule can be detected out through the instrument, and then confirm the position of leak source, so that the staff repairs. Therefore, the leakage point position of the aerostat capsule is judged by detecting whether the characteristic gas leaks, a worker does not need to enter the capsule, secondary damage to the capsule in the detection process is avoided, and the detection efficiency is improved. Further, the leak detection method of this application can detect out the small leak source on the utricule, has improved the leak source rate of detection, and detection efficiency is higher, and operating personnel need not direct contact utricule in the testing process, can not rub or fold the utricule, avoids causing the damage or the leakage of utricule in the testing process. In addition, the method for detecting the leakage of the aerostat capsule is applied to detect the leakage of the aerostat capsule, so that the air supplementing maintenance period of the aerostat can be prolonged, and the use cost is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
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| CN201811230586.5A CN111076873A (en) | 2018-10-22 | 2018-10-22 | Leak detection method for aerostat bladder and aerostat bladder |
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| CN201811230586.5A CN111076873A (en) | 2018-10-22 | 2018-10-22 | Leak detection method for aerostat bladder and aerostat bladder |
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| CN112985716A (en) * | 2021-01-18 | 2021-06-18 | 南京航空航天大学 | Aerostat envelope helium leakage monitoring device and method |
| CN114264426A (en) * | 2021-12-22 | 2022-04-01 | 华中科技大学 | System and method for detecting defect of leak point of aerostat capsule body |
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| CN112985716B (en) * | 2021-01-18 | 2022-06-10 | 南京航空航天大学 | Aerostat envelope helium leakage monitoring device and method |
| CN114264426A (en) * | 2021-12-22 | 2022-04-01 | 华中科技大学 | System and method for detecting defect of leak point of aerostat capsule body |
| CN114264426B (en) * | 2021-12-22 | 2022-09-20 | 华中科技大学 | Aerostat airbag leakage point defect detection system and method |
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Application publication date: 20200428 |