CN112461460A - Method for detecting leakage point in air tightness test in modular production - Google Patents
Method for detecting leakage point in air tightness test in modular production Download PDFInfo
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- CN112461460A CN112461460A CN202011123628.2A CN202011123628A CN112461460A CN 112461460 A CN112461460 A CN 112461460A CN 202011123628 A CN202011123628 A CN 202011123628A CN 112461460 A CN112461460 A CN 112461460A
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 238000013461 design Methods 0.000 claims abstract description 5
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000000344 soap Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 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
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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Abstract
The invention discloses a method for detecting leakage points in a gas tightness test in modular production, which comprises the following steps: s1, communicating the air source, the air pressure distribution table and the module to be tested; s2, supplying air and boosting pressure to the module to be tested; s3, raising the air pressure to 0.2-0.5 MPa, and performing the next step when the whole pressure test system is determined to be abnormal; s4, raising the air pressure to 50% of the test pressure; detecting by using an industrial acoustic imager; s5, continuously increasing the pressure detection step by step according to 10% of the test pressure; s6, detecting after the pressure is increased to the test pressure; s7, detecting the pressure drop to the design pressure; s8, when a leakage point occurs, disassembling the module to be tested, and detecting the leakage point again after reworking; and S9, disassembling the module to be tested after the air pressure is reduced to the atmospheric pressure, and finishing the pressure test. According to the detection method, the industrial acoustic imager is used for detection, the labor intensity of workers is reduced, meanwhile, some detection dead angles can be detected, and the accuracy of detection results is improved.
Description
Technical Field
The invention relates to a leakage point detection method, in particular to a leakage point detection method during detection of an air tightness test in modular production.
Background
In the modularized production process, pipelines, containers and the like are welded and assembled in a factory to form modules, and the modules need to detect the air tightness of welding seams, flange welding, threaded joints and other parts so as to meet the design requirements. The current main method for detecting the air tightness is to detect manually, namely, a module to be detected is connected into an air channel system, then soap liquid is smeared on a welding seam, a connector or a threaded connection part of each component on the module, a part with bubbles bulging is a leakage point, leakage is detected by matching of manual eye observation, ear hearing, hand touch and nose smell, the method for detecting the leakage by using the soap liquid is simple to operate, special equipment is not needed, and the leakage part is easy to find. However, some dead corner joints are not easy to be coated with soap water, and a leak point can be found only by careful observation, which takes much time.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the detection method utilizes an industrial acoustic imager to detect, reduces the labor intensity of workers, can detect some detection dead angles, and improves the accuracy of detection results.
In order to solve the technical problems, the technical scheme of the invention is as follows: a leak point detection method for a gas tightness test in modular production comprises the following steps:
s1, communicating the air source, the air pressure distribution table and the module to be tested in the modular production process through pipelines;
s2, opening an air source and an air pressure distribution table to supply air and boost pressure to the module to be tested;
s3, increasing the air pressure in the module to be tested to 0.2-0.5 Mpa, stabilizing the pressure for 9-11 minutes, detecting the whole pressure test system in the period, and carrying out the next step when the whole pressure test system is determined to be abnormal;
s4, increasing the air pressure in the module to be tested to 50% of the test pressure; stabilizing the pressure for 3-5 minutes; detecting the outside of the module to be tested by utilizing an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S5;
s5, continuously increasing the pressure step by step according to 10% of the test pressure, and stabilizing the pressure for 3-5 minutes at each step; detecting by using an industrial acoustic imager in the detection mode of the step S4 in each voltage stabilization process, marking a leakage point when the leakage of the module to be tested is found, storing the leakage point in a picture or video mode, and then entering the step S8; if no leakage point is found, the process proceeds to step S6;
s6, continuously increasing the pressure to the test pressure, stabilizing the pressure for 9-11 minutes, and detecting the outside of the module to be tested by using an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S7;
s7, reducing the pressure to the design pressure of the module to be tested, wherein the pressure stabilizing time exceeds 30 minutes, and the exterior of the module to be tested is detected by using an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S9;
s8, disassembling the module to be tested, re-processing the leakage point and then performing the steps S1-S7;
and S9, disassembling the module to be tested after the air pressure is reduced to the atmospheric pressure, and finishing the pressure test.
As a preferable scheme, the specific steps of the connection of the module to be tested in step S1 are as follows:
s11, providing a plugging plate component which comprises at least two plate bodies and an elastic sealing element arranged between two adjacent plate bodies in a squeezing mode; a communicating pipe is welded on the half body in a penetrating way;
s12, plugging the plugging plate component from the pipe opening of the module to be tested so that the elastic sealing element is sealed with the inner wall of the pipe opening;
s13, welding a plurality of L-shaped limit stops at the outer side of the pipe opening of the module to be tested for blocking the plate body of the plugging plate assembly;
and S14, communicating the communicating pipe with the air pressure distribution table so as to be connected into an air supply system.
As a preferable scheme, the disassembling manner of the steps S8 and S9 is: the L-shaped limiting baffle is taken down through hot melting, the communicating pipe is taken down from the air supply system, and then the communicating pipe is operated to pull out the plugging plate assembly from the pipe opening of the module to be tested.
Preferably, the number of the industrial acoustic imagers in the steps S4-S7 is at least two, and the shooting angles of the industrial acoustic imagers are different.
As a preferable scheme, the voltage stabilization time of the steps S3 and S6 is 10 minutes; the voltage stabilization time of steps S4 and S5 was 3 minutes.
After the technical scheme is adopted, the invention has the effects that: according to the detection method, the industrial acoustic imager is used for detection, the labor intensity of workers is reduced, meanwhile, some detection dead angles can be detected, and the accuracy of detection results is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a gas circuit system layout diagram of a detection method according to an embodiment of the present invention;
FIG. 2 is a partial cross-sectional view of a module under test;
Detailed Description
The present invention is described in further detail below with reference to specific examples.
As shown in fig. 1 and 2, a leak point detection method for a gas tightness test in a modular production includes the following steps:
s1, communicating the air source, the air pressure distribution table and the module to be tested in the modular production process through pipelines; as shown in fig. 1, the gas source in this embodiment is a compressed gas cylinder; all the connecting ports are communicated through pipelines;
the specific steps of the connection of the module to be tested in step S1 are as follows:
s11, providing a plugging plate component which comprises at least two plate bodies and an elastic sealing element arranged between two adjacent plate bodies in a squeezing mode; a communicating pipe is welded on the half body in a penetrating way;
s12, plugging the plugging plate component from the pipe opening of the module to be tested so that the elastic sealing element is sealed with the inner wall of the pipe opening;
s13, welding a plurality of L-shaped limit stops at the outer side of the pipe opening of the module to be tested for blocking the plate body of the plugging plate assembly;
and S14, communicating the communicating pipe with the air pressure distribution table so as to be connected into an air supply system.
S2, opening an air source and an air pressure distribution table to supply air and boost pressure to the module to be tested;
s3, increasing the air pressure in the module to be tested to 0.2-0.5 Mpa, stabilizing the pressure for 9-11 minutes, detecting the whole pressure test system in the period, and carrying out the next step when the whole pressure test system is determined to be abnormal;
s4, increasing the air pressure in the module to be tested to 50% of the test pressure; stabilizing the pressure for 3-5 minutes; detecting the outside of the module to be tested by utilizing an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S5;
s5, continuously increasing the pressure step by step according to 10% of the test pressure, and stabilizing the pressure for 3-5 minutes at each step; detecting by using an industrial acoustic imager in the detection mode of the step S4 in each voltage stabilization process, marking a leakage point when the leakage of the module to be tested is found, storing the leakage point in a picture or video mode, and then entering the step S8; if no leakage point is found, the process proceeds to step S6;
s6, continuously increasing the pressure to the test pressure, stabilizing the pressure for 9-11 minutes, and detecting the outside of the module to be tested by using an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S7;
s7, reducing the pressure to the design pressure of the module to be tested, wherein the pressure stabilizing time exceeds 30 minutes, and the exterior of the module to be tested is detected by using an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S9;
the number of the industrial acoustic imagers in the steps S4-S7 is at least two, and the shooting angles of the industrial acoustic imagers are different.
S8, disassembling the module to be tested, re-processing the leakage point and then performing the steps S1-S7;
and S9, disassembling the module to be tested after the air pressure is reduced to the atmospheric pressure, and finishing the pressure test. The disassembling mode of the steps S8 and S9 is as follows: the L-shaped limiting baffle is taken down through hot melting, the communicating pipe is taken down from the air supply system, and then the communicating pipe is operated to pull out the plugging plate assembly from the pipe opening of the module to be tested.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and alterations made to the technical solution of the present invention without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.
Claims (5)
1. A leak point detection method for a gas tightness test in modular production is characterized by comprising the following steps: the method comprises the following steps:
s1, communicating the air source, the air pressure distribution table and the module to be tested in the modular production process through pipelines;
s2, opening an air source and an air pressure distribution table to supply air and boost pressure to the module to be tested;
s3, increasing the air pressure in the module to be tested to 0.2-0.5 Mpa, stabilizing the pressure for 9-11 minutes, detecting the whole pressure test system in the period, and carrying out the next step when the whole pressure test system is determined to be abnormal;
s4, increasing the air pressure in the module to be tested to 50% of the test pressure; stabilizing the pressure for 3-5 minutes; detecting the outside of the module to be tested by utilizing an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S5;
s5, continuously increasing the pressure step by step according to 10% of the test pressure, and stabilizing the pressure for 3-5 minutes at each step; detecting by using an industrial acoustic imager in the detection mode of the step S4 in each voltage stabilization process, marking a leakage point when the leakage of the module to be tested is found, storing the leakage point in a picture or video mode, and then entering the step S8; if no leakage point is found, the process proceeds to step S6;
s6, continuously increasing the pressure to the test pressure, stabilizing the pressure for 9-11 minutes, and detecting the outside of the module to be tested by using an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S7;
s7, reducing the pressure to the design pressure of the module to be tested, wherein the pressure stabilizing time exceeds 30 minutes, and the exterior of the module to be tested is detected by using an industrial acoustic imager; when the module to be tested is found to have leakage, marking the leakage point, storing the leakage point in a picture or video mode and then entering the step S8; if no leakage point is found, the process proceeds to step S9;
s8, disassembling the module to be tested, re-processing the leakage point and then performing the steps S1-S7;
and S9, disassembling the module to be tested after the air pressure is reduced to the atmospheric pressure, and finishing the pressure test.
2. The method of claim 1, further comprising the step of: the specific steps of the connection of the module to be tested in the step S1 are as follows:
s11, providing a plugging plate component which comprises at least two plate bodies and an elastic sealing element arranged between two adjacent plate bodies in a squeezing mode; a communicating pipe is welded on the half body in a penetrating way;
s12, plugging the plugging plate component from the pipe opening of the module to be tested so that the elastic sealing element is sealed with the inner wall of the pipe opening;
s13, welding a plurality of L-shaped limit stops at the outer side of the pipe opening of the module to be tested for blocking the plate body of the plugging plate assembly;
and S14, communicating the communicating pipe with the air pressure distribution table so as to be connected into an air supply system.
3. The method of claim 2, further comprising the step of: the disassembling mode of the steps S8 and S9 is as follows: the L-shaped limiting baffle is taken down through hot melting, the communicating pipe is taken down from the air supply system, and then the communicating pipe is operated to pull out the plugging plate assembly from the pipe opening of the module to be tested.
4. A leak point detection method for a gas tightness test in a modular production as set forth in claim 3, wherein: the number of the industrial acoustic imagers in the steps S4-S7 is at least two, and the shooting angles of the industrial acoustic imagers are different.
5. The method of claim 4, further comprising the step of: the voltage stabilizing time of the steps S3 and S6 is 10 minutes; the voltage stabilization time of steps S4 and S5 was 3 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011123628.2A CN112461460A (en) | 2020-10-20 | 2020-10-20 | Method for detecting leakage point in air tightness test in modular production |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837312A (en) * | 2012-11-22 | 2014-06-04 | 赛龙通信技术（深圳）有限公司 | Airtightness automatic test system and test method |
| CN106197881A (en) * | 2016-06-24 | 2016-12-07 | 成都信息工程大学 | A kind of wireless acoustic imaging device of valve leak monitoring |
| CN110887613A (en) * | 2019-12-06 | 2020-03-17 | 华能山东石岛湾核电有限公司 | Sealing detection method for air pressure test of large pressure container |
| CN113654739A (en) * | 2021-08-09 | 2021-11-16 | 海口天行健药物研究有限公司 | Automatic air tightness detection system and detection method thereof |
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- 2020-10-20 CN CN202011123628.2A patent/CN112461460A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837312A (en) * | 2012-11-22 | 2014-06-04 | 赛龙通信技术（深圳）有限公司 | Airtightness automatic test system and test method |
| CN106197881A (en) * | 2016-06-24 | 2016-12-07 | 成都信息工程大学 | A kind of wireless acoustic imaging device of valve leak monitoring |
| CN110887613A (en) * | 2019-12-06 | 2020-03-17 | 华能山东石岛湾核电有限公司 | Sealing detection method for air pressure test of large pressure container |
| CN113654739A (en) * | 2021-08-09 | 2021-11-16 | 海口天行健药物研究有限公司 | Automatic air tightness detection system and detection method thereof |
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Application publication date: 20210309 |