CN113916456A - Safety valve sealing test method - Google Patents
Safety valve sealing test method Download PDFInfo
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- CN113916456A CN113916456A CN202111039616.6A CN202111039616A CN113916456A CN 113916456 A CN113916456 A CN 113916456A CN 202111039616 A CN202111039616 A CN 202111039616A CN 113916456 A CN113916456 A CN 113916456A
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- 238000007789 sealing Methods 0.000 title claims abstract description 20
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000004458 analytical method Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 230000002688 persistence Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 5
- 230000005587 bubbling Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- 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
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
- G01M3/086—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds for valves
Abstract
The invention relates to the technical field of equipment tests, in particular to a safety valve sealing test method, which comprises the steps of connecting a tested safety valve with an inflation system, and slowly inflating to enable the pressure value of the safety valve to rise to a preset pressure value; slowly placing the safety valve to be detected into a first preset position of a leakage detection groove filled with display liquid, and enabling the position to be detected to be upward; shooting bubble images of the safety valve to be detected by the camera equipment connected with the leak detection groove and transmitting the images to the upper computer; and analyzing and judging the tightness of the safety valve to be tested based on the data of the shot picture. Through carrying out analysis contrast to the picture of shooing bubbling and detecting the leakproofness, need not artifical naked eye and observe the detection constantly, improve the efficiency that the leakproofness detected.
Description
Technical Field
The invention relates to the technical field of equipment tests, in particular to a safety valve sealing test method.
Background
The safety valve is a special valve, wherein the opening and closing part is in a normally closed state under the action of external force, and when the pressure of a medium in equipment or a pipeline rises to exceed a specified value, the medium is discharged to the outside of the system to prevent the pressure of the medium in the pipeline or the equipment from exceeding the specified value. The reliable tightness of the safety valve is directly related to whether equipment is safe or not, so the tightness detection of the safety valve is very important, but the existing safety valve sealing test has low detection efficiency.
Disclosure of Invention
The invention aims to provide a safety valve sealing test method, which improves the safety valve sealing test detection efficiency.
In order to achieve the above object, the present invention provides a method for testing the sealing of a safety valve, comprising:
after the tested safety valve is connected with an inflation system, slowly inflating to enable the pressure value of the safety valve to rise to a preset pressure value;
slowly placing the safety valve to be detected into a first preset position of a leakage detection groove filled with display liquid, and enabling the position to be detected to be upward;
shooting bubble images of the safety valve to be detected by the camera equipment connected with the leak detection groove and transmitting the images to the upper computer;
and analyzing and judging the tightness of the safety valve to be tested based on the data of the shot picture.
In one embodiment, the method for analyzing and judging the tightness of the safety valve to be tested based on the data of the shot pictures comprises the following specific steps:
and acquiring a shot picture, extracting bubble features, and analyzing and judging the position fixity, uniformity and stability and continuity of bubbles.
In one embodiment, a shot picture is obtained, bubble feature extraction is performed, and analysis and judgment on the position fixity, the uniform stability and the continuity of bubbles are performed, and the method specifically comprises the following steps:
acquiring shot pictures in a first time period, screening the shot pictures with bubbles, extracting bubble features, and comparing whether the positions of the bubbles in the multiple shot pictures are in the same area range; if so, judging the uniformity and stability of the bubbles; if not, outputting the false leakage bubble information.
In one embodiment, the bubble uniformity stability determination specifically includes the steps of:
obtaining the diameter of the first bubble and the diameter of the last bubble from top to bottom in the area range of the bubbles, calculating the difference value, and judging whether the absolute value of the difference value is smaller than a preset absolute value of the difference value or not; if so, judging the continuity of the bubbles; if not, outputting the false leakage bubble information.
In one embodiment, the bubble persistence determining includes:
stirring bubble positions by stirring equipment arranged in the leakage detection groove to obtain shot pictures in a second time period, screening the shot pictures with bubbles, extracting bubble features, calculating the distance between two adjacent bubbles from top to bottom in the area range of the bubbles, and judging whether the absolute value of the distance difference is within a preset absolute value of the distance difference; if yes, carrying out replacement analysis and judgment on a preset position; if not, outputting the false leakage bubble information.
In one embodiment, the preset position replacement analysis and judgment specifically includes the following steps:
slowly lifting the safety valve to be detected to a second preset position of the leakage detection groove, and analyzing and judging the fixity, the uniform stability and the continuity of the bubble position again, wherein the distance from the second preset position to the display liquid level is less than the distance from the first preset position to the display liquid level; if the air bubble is qualified, outputting the real air bubble leakage information; if not, outputting the false leakage bubble information.
In one embodiment, before analyzing and determining the position fixity, the uniform stability and the persistence of the bubble, the method further comprises:
and (4) shooting an appearance picture of the safety valve to be detected, comparing the picture with a pre-stored picture of the safety valve with qualified sealing performance, and judging whether scratches and gaps exist.
According to the safety valve sealing test method, the tested safety valve is connected with the inflation system and then slowly inflated, so that the pressure value of the safety valve rises to the preset pressure value; slowly placing the safety valve to be detected into a first preset position of a leakage detection groove filled with display liquid, and enabling the position to be detected to be upward; shooting bubble images of the safety valve to be detected by the camera equipment connected with the leak detection groove and transmitting the images to the upper computer; and analyzing and judging the tightness of the safety valve to be tested based on the data of the shot picture. The realization is through carrying out analysis contrast to the picture of shooing bubbling and detecting the leakproofness, need not artifical naked eye and observes the detection constantly, improves the efficiency that the leakproofness detected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a safety valve sealing test method according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of step S104 provided in the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a safety valve sealing test method according to an embodiment of the present invention. Specifically, the safety valve sealing test method may include the steps of:
s101, slowly inflating after connecting the safety valve to be tested with an inflation system, and enabling the pressure value to rise to a preset pressure value;
in the embodiment of the invention, the inflation pressure value of the tested safety valve is improved, and the sensitivity of bubble leak detection can be improved. However, there is a limit to increase the pressure value, which is generally 5X 105Pa or less. Too high a pressure value may cause damage to the safety valve and personnel to be tested. The inflation pressure value is typically specified in a pattern or related standard. For the same leakage hole, under the same temperature and pressure difference conditions, gas with small relative molecular mass is easier to pass through the leakage hole than gas with large relative molecular mass, and the amount of leaked gas is more, so that the sensitivity of bubble leakage detection can be improved by filling gas with small relative molecular mass into the safety valve to be detected. The tested safety valve is filled with hydrogen and helium, and the leak detection sensitivity is higher than that of filling air and nitrogen. However, hydrogen is flammable and explosive, and is not suitable for use because of poor safety. Helium is an inert gas and is safe, but somewhat expensive. So clean compressed air or nitrogen is typically used in bubble leak detection.
S102, slowly placing the safety valve to be detected into a first preset position of a leakage detection groove filled with display liquid, and enabling the position to be detected to be upward;
in the embodiment of the invention, the liquid is slowly put in to avoid the phenomenon that the displayed liquid shakes too much, the time for waiting for the liquid level to be calm is long, and the detection time is prolonged. The surface tension coefficient of the display liquid is small, the resistance of gas leaked from the liquid at the outlet of the leak hole is small, and the generation and floating of bubbles are facilitated, so that the bubble leak detection sensitivity can be improved by selecting the display liquid with the small surface tension coefficient. Common display liquids are water, alcohol, fluorine oil, and the like. The surface tension coefficient of water was 73X 10-3N/m; the alcohol content is 22X 10-3N/m; FC-43 high-boiling fluoro oil is 21X 10-3N/m; the low-boiling-point fluorine oil F113 was 19X 10-3N/m. In comparison, the sensitivity of F113 was the highest and the sensitivity of water was the lowest when detecting bubble leakage. The first preset position is a fixed position of the safety valve to be detected, which is arranged in the leakage detection groove and is apart from the display liquid level.
S103, shooting bubble images of the safety valve to be detected by the camera connected with the leakage detecting groove and transmitting the images to an upper computer;
in the embodiment of the invention, the photographic equipment is a waterproof camera device in the prior art, and can shoot the safety valve to be detected and the surrounding environment.
And S104, analyzing and judging the tightness of the safety valve to be tested based on the shot picture data.
In the embodiment of the invention, the safety valve with qualified sealing performance shows that no air bubbles emerge from the liquid; the safety valve with unqualified sealing performance shows that bubbles can emerge from the liquid, but whether the bubbles emerge as true leakage bubbles or false leakage bubbles needs to be distinguished. The position of the bubble generated by the vacuum leakage is fixed, the bubble is uniform and stable, and the bubble can be continuously generated after being wiped; the bubbles generated by false leakage are often caused by the escape of gas in gaps or the deflation of organic matters adhered to the surface of the tested safety valve, the positions are not fixed, the bubbles are uneven and smaller, the fewer the bubbles are, and the bubbles can not be generated after the original bubbles are wiped off. Therefore, it is necessary to acquire a shot picture, perform bubble feature extraction, and analyze and determine the position fixity, uniformity and stability and continuity of bubbles. The specific extraction mode can adopt gray feature extraction, and the gray feature can be measured on certain specific pixel points of the image or in the neighborhood of the certain specific pixel points of the image or in a certain area. The feature extraction can also be performed by using the perimeter and the area, which are the most basic features for describing the size of the image region, and the perimeter and the area are only related to the edge of the region and are not related to the change of the internal gray value of the region. The common area calculation method includes that firstly, the area is calculated by utilizing pixel points; secondly, calculating the area by using the chain code; and thirdly, calculating the area by using the edge coordinates. Referring to fig. 2, the following is a specific process of analysis and judgment: the specific steps for judging the position fixity of the bubbles are as follows: acquiring shot pictures in a first time period, screening the shot pictures with bubbles, extracting bubble features, and comparing whether the positions of the bubbles in the multiple shot pictures are in the same area range; if so, judging the uniformity and stability of the bubbles; if not, outputting the false leakage bubble information. Short-time bubbles may not have overflowed and the data is not referential and therefore requires taking a bubbling picture over a period of time for analysis. The bubble positions in the multiple shot pictures are in the same area range, which indicates that the bubble positions are relatively fixed, and if the bubble positions are not in the same area range, the bubble positions are not generated due to air leakage of the safety valve to be detected but due to other reasons (such as air leakage), for example, gas accumulated in blind holes or pits on the safety valve to be detected escapes to form bubbles. After the bubble preliminary judgement position is fixed, carry out the even stability of bubble and judge, concrete step includes: obtaining the diameter of the first bubble and the diameter of the last bubble from top to bottom in the area range of the bubbles, calculating the difference value, and judging whether the absolute value of the difference value is smaller than a preset absolute value of the difference value or not; if so, judging the continuity of the bubbles; if not, outputting the false leakage bubble information. If the absolute value of the difference is larger than or equal to the preset absolute value of the difference, the bubbles are not uniform and smaller, and the bubbles are not generated by air leakage if the absolute value of the difference is smaller. Then, judging the continuity of the bubbles, and specifically comprising the following steps of: stirring bubble positions by stirring equipment arranged in the leakage detection groove to obtain shot pictures in a second time period, screening the shot pictures with bubbles, extracting bubble features, calculating the distance between two adjacent bubbles from top to bottom in the area range of the bubbles, and judging whether the absolute value of the distance difference is smaller than the preset absolute value of the distance difference; if yes, carrying out replacement analysis and judgment on a preset position; if not, outputting the false leakage bubble information. Namely, the original bubbles are erased, and then the bubbles which emerge are continuously detected, and the absolute value of the distance difference is too large, which indicates that the bubbles are not continuous and are not bubbles generated by air leakage. The method comprises the following specific steps of: slowly lifting the safety valve to be detected to a second preset position of the leakage detection groove, and analyzing and judging the fixity, the uniform stability and the continuity of the bubble position again, wherein the distance from the second preset position to the display liquid level is less than the distance from the first preset position to the display liquid level; if the air bubble is qualified, outputting the real air bubble leakage information; if not, outputting the false leakage bubble information. The smaller the distance between the air leakage part and the liquid level is, the more easily the air bubbles are formed and discharged, so the smaller the depth of the tested safety valve embedded in the display liquid is, the higher the leakage detection sensitivity is, the further the air leakage detection is carried out, and the detection accuracy is improved.
In addition, before analyzing and judging the position fixity, the uniform stability and the continuity of the bubbles, the method further comprises the following steps: and (4) shooting an appearance picture of the safety valve to be detected, comparing the picture with a pre-stored picture of the safety valve with qualified sealing performance, and judging whether scratches and gaps exist. Whether the air leakage phenomenon is caused by the appearance of the product is judged, if not, then the internal detection is carried out, the leakage fault reason is eliminated step by step, and the repair and the replacement are convenient.
And if the analysis judges that the tightness of the safety valve to be tested is not qualified, acquiring the size and the shape of the bubbles and the formation rate of the bubbles, and grading the leakage. And the leakage rating is carried out, so that the leakage degree of the tested safety valve can be known conveniently, the product fault treatment such as replacement, repair, rework and scrap can be carried out conveniently, and the product utilization rate is improved. Specifically, if the bubbles are small, the formation rate is uniform, and the bubble duration is long, low-level leakage information is output, which means that the leakage porosity is 10-5～10-2Pa·m3A range of/s; if the random large bubble and small bubble mixing phenomenon occurs, middle-level leakage information is output, which means that the leakage hole rate is 10-2～10-1Pa·m3(ii) a range of/s. If it occursLarge bubbles, high formation rate and short duration, and output high-grade leakage information, meaning that the leakage rate is 10-1～1Pa·m3(ii) a range of/s.
Furthermore, before analyzing and judging the tightness of the safety valve to be tested based on the shot picture data, the method further comprises the following steps: and preprocessing the shot picture, wherein the preprocessing comprises the steps of carrying out lossless amplification, definition enhancement and contrast enhancement on the shot picture. The lossless amplification treatment is to amplify the shot picture by two times in the length and width directions respectively, so that the image quality is kept lossless; the definition enhancement processing is to rapidly de-noise the shot picture and optimize the texture details of the image so as to make the image clearer; the contrast enhancement processing is to adjust the contrast of the too dark or too bright shot picture, so that the image is more vivid, the bubble characteristics can be accurately extracted for analysis and judgment, and the detection accuracy is further improved.
According to the safety valve sealing test method, the tested safety valve is connected with the inflation system and then slowly inflated, so that the pressure value of the safety valve rises to the preset pressure value; slowly placing the safety valve to be detected into a first preset position of a leakage detection groove filled with display liquid, and enabling the position to be detected to be upward; shooting a bubble image of the safety valve by using photographic equipment connected with the leak detection groove and transmitting the bubble image to an upper computer; and analyzing and judging the tightness of the safety valve based on the shot picture data. The realization is through carrying out analysis contrast to the picture of shooing bubbling and detecting the leakproofness, need not artifical naked eye and observes the detection constantly, improves the efficiency and the accuracy that the leakproofness detected.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A safety valve sealing test method is characterized by comprising the following steps:
after the tested safety valve is connected with an inflation system, slowly inflating to enable the pressure value of the safety valve to rise to a preset pressure value;
slowly placing the safety valve to be detected into a first preset position of a leakage detection groove filled with display liquid, and enabling the position to be detected to be upward;
shooting bubble images of the safety valve to be detected by the camera equipment connected with the leak detection groove and transmitting the images to the upper computer;
and analyzing and judging the tightness of the safety valve to be tested based on the data of the shot picture.
2. The safety valve seal test method of claim 1, wherein the step of analyzing and judging the tightness of the safety valve to be tested based on the data of the shot pictures comprises the following steps:
and acquiring a shot picture, extracting bubble features, and analyzing and judging the position fixity, uniformity and stability and continuity of bubbles.
3. The safety valve sealing test method according to claim 2, wherein a shot picture is obtained, bubble feature extraction is performed, and the analysis and judgment on the position fixity, the uniform stability and the continuity of bubbles are performed, and the method comprises the following specific steps:
acquiring shot pictures in a first time period, screening the shot pictures with bubbles, extracting bubble features, and comparing whether the positions of the bubbles in the multiple shot pictures are in the same area range; if so, judging the uniformity and stability of the bubbles; if not, outputting the false leakage bubble information.
4. The safety valve seal test method according to claim 3, wherein the judgment of the uniformity and stability of the bubbles comprises the following specific steps:
obtaining the diameter of the first bubble and the diameter of the last bubble from top to bottom in the area range of the bubbles, calculating the difference value, and judging whether the absolute value of the difference value is smaller than a preset absolute value of the difference value or not; if so, judging the continuity of the bubbles; if not, outputting the false leakage bubble information.
5. The safety valve seal test method according to claim 4, wherein the bubble persistence judgment comprises the following specific steps:
stirring bubble positions by stirring equipment arranged in the leakage detection groove to obtain shot pictures in a second time period, screening the shot pictures with bubbles, extracting bubble features, calculating the distance between two adjacent bubbles from top to bottom in the area range of the bubbles, and judging whether the absolute value of the distance difference is smaller than the preset absolute value of the distance difference; if yes, carrying out replacement analysis and judgment on a preset position; if not, outputting the false leakage bubble information.
6. The safety valve seal test method of claim 5, wherein the predetermined position replacement analysis and determination comprises the steps of:
slowly lifting the safety valve to be detected to a second preset position of the leakage detection groove, and analyzing and judging the fixity, the uniform stability and the continuity of the bubble position again, wherein the distance from the second preset position to the display liquid level is less than the distance from the first preset position to the display liquid level; if the air bubble is qualified, outputting the real air bubble leakage information; if not, outputting the false leakage bubble information.
7. The safety valve seal test method of claim 1, wherein prior to the analytical determination of bubble position fixity, uniformity stability, and persistence, the method further comprises:
and (4) shooting an appearance picture of the safety valve to be detected, comparing the picture with a pre-stored picture of the safety valve with qualified sealing performance, and judging whether scratches and gaps exist.
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| CN202111039616.6A CN113916456A (en) | 2021-09-06 | 2021-09-06 | Safety valve sealing test method |
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| CN202111039616.6A CN113916456A (en) | 2021-09-06 | 2021-09-06 | Safety valve sealing test method |
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2021
- 2021-09-06 CN CN202111039616.6A patent/CN113916456A/en active Pending
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| CN105389814A (en) * | 2015-11-03 | 2016-03-09 | 浙江工业大学 | Air bubble detection method for air tightness test |
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