CN116625597A - Leakage test method and device for built-in system in explosion-proof shell - Google Patents
Leakage test method and device for built-in system in explosion-proof shell Download PDFInfo
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- CN116625597A CN116625597A CN202310523380.6A CN202310523380A CN116625597A CN 116625597 A CN116625597 A CN 116625597A CN 202310523380 A CN202310523380 A CN 202310523380A CN 116625597 A CN116625597 A CN 116625597A
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- 238000010998 test method Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 79
- 239000001307 helium Substances 0.000 claims abstract description 20
- 229910052734 helium Inorganic materials 0.000 claims abstract description 20
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 13
- 238000000605 extraction Methods 0.000 claims description 22
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000004880 explosion Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 18
- 238000007789 sealing Methods 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012797 qualification 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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The application provides a leakage test method and a leakage test device for a built-in system in an explosion-proof shell, and belongs to the technical field of explosion-proof detection. The test method comprises the following steps: the explosion-proof shell is connected with a vacuum pumping device, and the built-in system is connected with a high-pressure air source; starting a high-pressure gas source to charge helium into the built-in system to 1kPa; acquiring initial pressure inside the explosion-proof shell, starting vacuumizing equipment to extract air inside the explosion-proof shell, and acquiring a first time length; if the absolute pressure in the explosion-proof shell still does not reach 0.1Pa after the first time period, judging that the built-in system leakage test is not qualified; after the absolute pressure in the explosion-proof shell reaches 0.1Pa, the vacuumizing equipment continues to pump for a second time period, and if the absolute pressure in the explosion-proof shell in the second time period is not more than 0.1Pa, the built-in system leakage test is judged to be qualified; otherwise, judging that the built-in system leakage test is not qualified. The application has strong operability and can accurately judge the result of the built-in system leakage test.
Description
Technical Field
The application belongs to the technical field of explosion-proof detection, and particularly relates to a leakage test method and a leakage test device for a built-in system in an explosion-proof shell.
Background
With the development and progress of social economy, more and more devices are required to meet the requirements of miniaturization, integration, automation and intellectualization, and the specific implementation of the devices on flameproof products is that the analysis and the control of process fluid are required on site, and the devices are flameproof shells with internal release sources (built-in systems). For the explosion-proof housing product with the built-in system, when the explosion-proof safety inspection is carried out, the leakage performance of the built-in system needs to be inspected to verify the reliability of the built-in system.
Although the current standard prescribes a method and a qualification standard of a built-in system leakage test, the method is only a basic requirement, and the implementation process is not described in detail, so that the operability is not strong.
Disclosure of Invention
The application aims to solve the technical problem of providing a leakage test method and a test device for a built-in system in an explosion-proof shell aiming at the defects of the prior art.
In order to solve the technical problems, the application adopts the following technical scheme:
a leak test method of a built-in system in an explosion-proof enclosure, comprising:
s1, connecting vacuum equipment on an explosion-proof shell, and connecting a high-pressure air source on a built-in system;
s2, starting a high-pressure gas source to charge helium into the built-in system to 1kPa;
s3, acquiring initial pressure inside the explosion-proof shell, starting vacuumizing equipment to extract air inside the explosion-proof shell, and acquiring a first time length;
s4, if the absolute pressure in the explosion-proof housing still does not reach 0.1Pa after the first time period, judging that the built-in system leakage test is unqualified;
s5, after the absolute pressure in the explosion-proof housing reaches 0.1Pa, continuously extracting a second time period by the vacuumizing equipment, and judging that the built-in system leakage test is qualified if the absolute pressure in the explosion-proof housing is not more than 0.1Pa in the second time period; otherwise, judging that the built-in system leakage test is not qualified.
Further, the first time period t=2.303× (V/S) ×lg (P 0 /P 2 )×R，V＝V 1 +V 2 Wherein V is 1 For the volume of the flameproof cavity, V 2 The inner volume of the pipeline communicated with the flameproof shell is S the pumping speed of the vacuumizing equipment, P 0 R is an adjustment coefficient and P is the initial pressure of the flameproof shell 2 Target pressure of extraction, P 2 ＝0.1Pa。
Further, step S3 is:
s31, acquiring initial pressure in the explosion-proof housing, starting the vacuumizing equipment to extract air in the explosion-proof housing, and acquiring starting time of the vacuumizing equipment;
s32, acquiring the absolute pressure inside the explosion-proof shell at another moment;
s33, acquiring a first duration.
Further, the first duration t= (T 1 -T 0 )×R×lg(P 0 /P 2 )/lg(P 0 /P 1 ) Wherein T is 1 For the other time T 0 P is the starting time of the vacuumizing equipment 0 For the initial pressure of the flameproof housing, P 1 For the other time T 1 The explosion isolationAbsolute pressure inside the shell, R is an adjustment coefficient, P 2 Target pressure of extraction, P 2 ＝0.1Pa。
Further, the starting time T 0 And said another moment T 1 Are time stamps.
Further, the second duration is 1% of the first duration.
Further, the absolute pressure inside the flameproof housing is obtained by an absolute pressure gauge; the accuracy of the absolute pressure gauge is less than 0.1Pa.
Furthermore, the absolute pressure gauge is also used for transmitting the pressure value to the upper computer.
A leak test apparatus for a system built into an flameproof housing, comprising: the vacuum-pumping device is communicated with the inside of the flameproof shell through a first pipeline, a high-pressure air source is communicated with the inside of the built-in system through a second pipeline, a first pressure gauge is used for monitoring the absolute pressure inside the flameproof shell, and a second pressure gauge is used for monitoring the absolute pressure inside the built-in system;
the minimum pressure of the vacuumizing equipment for vacuumizing is not more than 0.1Pa, the maximum pressure of the high-pressure air supply is not less than lkPa, and the accuracy of the first pressure gauge is less than 0.1Pa.
Further, the device also comprises an upper computer, wherein the upper computer is electrically connected with the first pressure gauge and used for acquiring the pressure value of the first pressure gauge.
The built-in system is the part of the apparatus that contains the process fluid that may pass through the flameproof housing and cause release to the inside of the flameproof housing or wiring system. In the current standard, the type test of the built-in system includes a leak test, but the leak test method specified in the standard is only a basic requirement, and the implementation process is not described in detail, and the operability is not provided.
Two leakage test methods are specified in the current standard, wherein the first method needs to fill helium with rated pressure in an explosion-proof shell outside the built-in system, and simultaneously vacuumize the interior of the built-in system, so that the leakage gas flow direction of the built-in system from outside to inside is achieved, and whether the leakage test of the built-in system is qualified is judged by monitoring the absolute pressure inside the built-in system. The second method is to fill helium with rated pressure into the built-in system and vacuumize the explosion-proof shell outside the built-in system, so as to achieve the flow direction of leakage gas from inside to outside of the built-in system, and judge whether the leakage test of the built-in system is qualified or not by monitoring the absolute pressure inside the explosion-proof shell.
The existing equipment has higher requirements on the tightness of a built-in system, but the external explosion-proof shell cannot ensure perfect tightness due to numerous interfaces. In the first method, therefore, if leakage occurs in the high-pressure helium gas filled in the explosion-proof shell, there is a risk of inert gas asphyxiation; in the second method, the high-pressure helium is in the built-in system, so that the helium is not easy to leak from the built-in system, and even if leakage occurs, the helium is blocked by the external flameproof housing, so that the risk is lower. Second, the first method charges a volume of helium that far exceeds the second method, and therefore the second method uses less helium at a lower cost. Finally, the built-in system of the equipment is connected with the own equipment of a manufacturer, so that standard interfaces may not be arranged, and the interfaces of the built-in systems are different, and the connecting pipe orifice of the vacuumizing equipment is single, so that the operation difficulty is high when the vacuumizing equipment is connected with the built-in system. Therefore, for the above reasons, the present application proposes a leak test method for a built-in system according to a second method.
The second method needs to vacuumize the flameproof shell of the equipment to be tested, but under the condition that the sealing performance of the flameproof shell cannot be guaranteed, if the absolute pressure of the flameproof shell does not reach the standard, whether the flameproof shell is caused by the leakage of the built-in system or the leakage of the flameproof shell cannot be determined, so that the leakage test of the built-in system is interfered. For this case, the application can also be used with a sealed test tank as an explosion proof enclosure for the equipment. During the test, the built-in system of the equipment to be tested is independently arranged in the sealed test tank, or the whole equipment to be tested is arranged in the sealed test tank, and meanwhile, the pipe orifice on the original flameproof shell of the equipment is opened, so that the inside and the outside of the flameproof shell are communicated. The sealing test tank has good sealing performance, is widely applied to the field of explosion-proof detection, and can also be applied to leakage tests on built-in systems. In order to ensure perfect sealing performance, the sealing test tank is provided with only two pipe orifices, one pipe orifice is used for connecting the vacuumizing equipment 3, and the other pipe orifice is used for connecting the built-in system (the pipe orifice at the other end of the built-in system is subjected to sealing treatment).
Because the leak test of the built-in system is judged by observing that the explosion-proof shell can maintain the absolute pressure of 0.1Pa in the air extraction process of the vacuum-pumping equipment, the air extraction speed of the vacuum-pumping equipment cannot be too high, otherwise, even if the built-in system leaks to the explosion-proof shell, if the air extraction speed is higher than the leak speed, the explosion-proof shell still maintains the absolute pressure of 0.1Pa, so that the erroneous judgment on the leak test result of the built-in system is caused. However, under the condition that the air extraction speed of the vacuumizing equipment is low, the time for extracting the air in the flameproof shell of the equipment to be tested, especially the air in the sealed test tank, is long, and the air extraction time is even longer than 30 minutes. However, the premise of judging the leakage test is that the explosion-proof shell needs to be vacuumized to 0.1Pa, and in the vacuumizing process, if the built-in system leaks to the explosion-proof shell, the vacuumizing time of the explosion-proof shell to 0.1Pa can be greatly prolonged, so that the test time consumption is greatly increased, and even if the built-in system leaks seriously, the explosion-proof shell cannot be vacuumized to 0.1Pa.
Therefore, the application sets an index of the first time length, which represents the theoretical time length of vacuumizing the explosion-proof shell to 0.1Pa, and is used as the first judging standard of the leakage performance of the built-in system, if the explosion-proof shell cannot be vacuumized to 0.1Pa in the first time length, the leakage of the built-in system is indicated, and the failure of the leakage test of the built-in system can be directly judged.
The first time length cannot be smaller than the theoretical time length for vacuumizing the explosion-proof shell to 0.1Pa, namely the first time length is determined by the theoretical extraction time length, and the theoretical extraction time length is related to the volume inside the explosion-proof shell (explosion-proof cavity) and the extraction speed of the vacuumizing equipment, so the application provides a calculation method of the first time length, and the calculation method is mainly based on the volume of the explosion-proof cavity and the extraction speed of the vacuumizing equipment. However, considering that the volume of the explosion-proof cavity may not be obtained accurately, the influence of other cavities in the pipeline and the inaccurate air extraction speed of the vacuumizing equipment, the application sets the adjustment coefficient in the calculation method so that the first time length can meet the actual requirement.
Furthermore, the application also provides another calculation method for the first time length, which predicts the first time length through the change of the absolute pressure in the explosion-proof shell in a certain time, and the calculation process does not relate to indexes which cannot be accurately quantified, such as the volume of the explosion-proof cavity, the air extraction speed of the vacuumizing equipment and the like, so that the calculated first time length is more accurate. Meanwhile, an adjustment coefficient is still set so that the first time length can meet the actual requirement.
Compared with the prior art, the application has the following beneficial effects:
the built-in system leakage test method and the leakage test device provided by the application have strong operability, and can accurately quantify and judge the leakage test result so as to test the reliability of the built-in system through the leakage test.
In the built-in system leakage test method provided by the application, the first duration is also set, and if the explosion-proof shell cannot be vacuumized to 0.1Pa in the first duration, the built-in system leakage is indicated, so that the leakage test failure of the built-in system can be directly judged in the vacuumizing stage. The first time length can be calculated by utilizing the volume of the explosion-proof cavity and the air extraction speed of the vacuumizing equipment, and the influence of unquantified indexes is corrected by setting an adjusting coefficient, so that the first time length can meet the actual requirement. The first time length can also be obtained by utilizing the change of the absolute pressure of the explosion-proof housing in a certain time, so that the influence of partial unqualified indexes is eliminated, and the calculated first time length is more accurate.
The application is also provided with the upper computer, and the upper computer can acquire the absolute pressure in the explosion-proof shell by utilizing the first pressure gauge, so that the upper computer can automatically calculate the first duration by monitoring the value of the first pressure gauge; meanwhile, after the absolute pressure in the explosion-proof shell reaches 0.1Pa, the upper computer can automatically judge whether the leakage test of the built-in system is qualified according to the reading of the first pressure gauge.
Drawings
The present application will be described in further detail with reference to the accompanying drawings.
Fig. 1: schematic of example 1 of the present application;
fig. 2: schematic of example 3 of the present application;
fig. 3: the flow chart of embodiment 4 of the present application;
fig. 4: a flowchart of step S3 in embodiment 5 of the present application;
wherein: 1-explosion-proof shell, 2-built-in system, 3-vacuumizing equipment, 4-high-pressure air source, 5-first pressure gauge, 6-second pressure gauge, 7-first pipeline, 8-second pipeline, 9-first solenoid valve and 10-second solenoid valve.
Detailed Description
For a better understanding of the present application, the content of the present application will be further clarified below with reference to the examples and the accompanying drawings, but the scope of the present application is not limited to the following examples only. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the application may be practiced without one or more of these details.
Referring to fig. 1 or 2, a built-in system 2 of the equipment to be tested is disposed inside an explosion-proof housing 1 thereof and communicates with the outside of the explosion-proof housing 1 through an access duct. The present application is used to perform leak tests on the built-in system 2 to verify its reliability.
Example 1: referring to fig. 1, an object of the present embodiment is to provide a leak test apparatus for a system built in an explosion-proof housing. Comprising the following steps: the vacuum pumping device 3 communicated with the inside of the flameproof housing 1 by the first pipeline 7, the high-pressure air source 4 communicated with the inside of the built-in system 2 by the second pipeline 8, the first pressure gauge 5 for monitoring the absolute pressure inside the flameproof housing 1 and the second pressure gauge 6 for monitoring the absolute pressure inside the built-in system 2.
However, the sealing performance of the flameproof housing 1 of a part of equipment to be tested cannot be guaranteed, and gas leakage may occur in the flameproof housing 1 during the test, so that the result of the built-in system leakage test is affected. In view of the situation, the application is provided with a sealed test tank (such as an explosion test tank) serving as the explosion-proof housing 1, wherein the built-in system 2 of the equipment to be tested is independently arranged in the sealed test tank, or the equipment to be tested is integrally arranged in the sealed test tank, and meanwhile, an opening on the explosion-proof housing is opened to ensure that the explosion-proof housing is communicated with the interior of the sealed test tank. Accordingly, the flameproof housing 1 shown in fig. 1 may be either an flameproof housing of the apparatus to be tested itself or a separately provided sealed test tank. The sealing test tank must ensure perfect sealing performance, so that only two pipe orifices can be arranged on the tank body, one pipe orifice is used for connecting the vacuumizing device 3, and the other pipe orifice is used for connecting the built-in system (the pipe orifice at the other end of the built-in system is used for sealing treatment), so that the sealing performance of the tank body is prevented from being influenced by the arrangement of excessive pipe orifices.
The flameproof housing 1 may not be provided with an excessive nozzle in order to ensure sealing performance, so that the flameproof housing 1 does not have an excessive nozzle to install the first pressure gauge 5 after the first pipe 7 is connected, and therefore, the present application provides the first pressure gauge 5 on the first pipe 7 or on the vacuumizing device 3. Similarly, a second pressure gauge 6 is also provided on the second conduit 8, or on the high pressure gas source 4. The first pipe 7 and the second pipe 8 are both metal pipes.
The minimum pressure of the air suction of the vacuumizing device 3 is not more than 0.1Pa, the maximum pressure of the air supplied by the high-pressure air source 4 is not less than 1kPa, and the accuracy of the first pressure gauge 5 is less than 0.1Pa. In order to meet the air extraction performance, the vacuum-pumping equipment 3 can adopt a Roots diffusion vacuum unit; the high pressure gas source 4 is used for supplying helium, and a high pressure helium bottle is selected.
The leak test of the built-in system 2 using this embodiment is performed as follows: closing other pipe orifices of the built-in system 2, filling helium into the built-in system 2 by utilizing the high-pressure air source 4, and closing the high-pressure air source 4 when the reading of the second pressure gauge 6 reaches 1kPa; and then starting the vacuumizing equipment 3 to extract air in the explosion-proof shell 1, continuously obtaining the reading of the first pressure gauge 5 when the reading of the first pressure gauge 5 reaches 0.1Pa, and judging that the leakage test of the built-in system 2 is qualified if the reading of the first pressure gauge 5 does not exceed 0.1Pa within a preset time period (such as 10 seconds). The predetermined time length can be determined according to parameters such as the size of the explosion-proof cavity of the equipment, the air extraction speed of the vacuumizing equipment 3 and the like.
In order to facilitate the reading of the pressure values during the test, the first pressure gauge 5 and the second pressure gauge 6 are digital pressure gauges.
Example 2: the embodiment aims to provide a leakage test device of a built-in system in an explosion-proof housing. The present example was modified on the basis of example 1 as follows: also comprises an upper computer.
The first pressure gauge 5 is a precise digital pressure gauge, has the precision of 0.01Pa, is electrically connected with an upper computer, and can send the absolute pressure value of the detected flameproof housing 1 to the upper computer; the upper computer is used for recording and analyzing the absolute pressure of the flameproof housing 1 and judging the leakage test result of the built-in system 2.
The upper computer is also electrically connected with the vacuumizing equipment 3, and can control the starting or closing of the vacuumizing equipment 3.
The leak test of the built-in system 2 using this embodiment is performed as follows: closing other pipe orifices of the built-in system 2, filling helium into the built-in system 2 by utilizing the high-pressure air source 4, and closing the high-pressure air source 4 when the reading of the second pressure gauge 6 reaches 1kPa; then starting the vacuumizing equipment 3 to extract the air in the explosion-proof shell 1, continuously acquiring and recording the reading of the first pressure gauge 5 by the upper computer, and ending the test after continuously extracting for a preset time (such as 10 seconds) after the reading of the first pressure gauge 5 reaches 0.1 Pa; and the upper computer analyzes the recorded absolute pressure value, and if other data in a preset time length after the first data which is not more than 0.1Pa are not more than 0.1Pa, the leak test of the built-in system 2 is judged to be qualified. The predetermined time length can be determined according to parameters such as the size of the explosion-proof cavity of the equipment, the air extraction speed of the vacuumizing equipment 3 and the like.
Example 3: referring to fig. 2, an object of the present embodiment is to provide a leak test apparatus for a system built in an explosion-proof housing. The present example was modified on the basis of example 2 as follows: the first pipeline 7 is also provided with a first electromagnetic valve 9, and the second pipeline 8 is also provided with a second electromagnetic valve 10. The first solenoid valve 9 is located between the first pressure gauge 5 and the evacuation device 3, and the second solenoid valve 10 is located between the second pressure gauge 6 and the high pressure source 4.
And the first electromagnetic valve 9 and the second electromagnetic valve 10 are electrically connected with the upper computer, so that the upper computer can control the on-off of the first pipeline 7 and the second pipeline 8. The second pressure gauge 6 is electrically connected with the upper computer, so that the upper computer can acquire the absolute pressure of the built-in system 2.
The leak test of the built-in system 2 using this embodiment is performed as follows: closing other pipe orifices of the built-in system 2, filling helium into the built-in system 2 by utilizing a high-pressure air source 4, and closing a second pipeline 8 by utilizing a second electromagnetic valve 10 when the upper computer detects that the absolute pressure of the built-in system 2 reaches 1kPa; then starting the vacuumizing equipment 3 to extract air in the explosion-proof housing 1, continuously acquiring and recording the reading of the first pressure gauge 5 by the upper computer, closing the first pipeline 7 by using the first electromagnetic valve 9 after the reading of the first pressure gauge 5 reaches 0.1Pa, and ending the test after the test is continued for a preset time (such as 10 seconds); and the upper computer analyzes the recorded absolute pressure value, and if the pressure value is smaller than a preset value when the test is finished, the upper computer judges that the leakage test of the built-in system 2 is qualified. The preset time length and the preset value can be determined according to parameters such as the size of the explosion-proof cavity of the equipment, the air extraction speed of the vacuumizing equipment 3 and the like.
Example 4: the embodiment aims to provide a leakage test method for a system built in an explosion-proof housing. The test method was carried out using the leak test apparatus described in example 1, as shown in fig. 3, and the test method includes:
step S1, connecting vacuum pumping equipment 3 on the flameproof housing 1, and connecting a high-pressure air source 4 on the built-in system 2.
As shown in fig. 2, the vacuum-pumping device 3 is connected to a pipe orifice on the flameproof housing 1 by using a first pipe 7, so that the vacuum-pumping device 3 can pump air in the flameproof housing 1. The high-pressure air source 4 is connected with a pipe orifice at one end of the built-in system 2 by a second pipeline 8, and the pipe orifice at the other end of the built-in system 2 is closed.
Meanwhile, a first pressure gauge 5 capable of detecting the absolute pressure inside the flameproof housing 1 is arranged on the vacuumizing device 3 or the first pipeline 7; a second pressure gauge 6 capable of detecting the absolute pressure inside the built-in system 2 is provided on the high pressure gas source 4 or on the second pipe 8.
The minimum pressure of the air suction of the vacuumizing device 3 is not more than 0.1Pa, the maximum pressure of the air supplied by the high-pressure air source 4 is not less than 1kPa, and the accuracy of the first pressure gauge 5 is less than 0.1Pa. In order to meet the air extraction performance, the vacuum-pumping equipment 3 can adopt a Roots diffusion vacuum unit; the high pressure gas source 4 is used for supplying helium, and a high pressure helium bottle is selected.
Step S2, starting the high-pressure air source 4 to charge helium into the built-in system 2 to 1kPa.
Helium is filled into the built-in system 2 by the high-pressure air source 4, and when the reading of the second pressure gauge 6 reaches 1kPa, the high-pressure air source 4 is closed to stop the inflation.
Step S3, acquiring initial pressure inside the flameproof housing 1, starting the vacuumizing device 3 to extract air inside the flameproof housing 1, and acquiring a first time length T.
Acquiring initial pressure P in flameproof housing 1 by using first pressure gauge 5 0 A first time length T, T=2.303× (V/S) ×lg (P) 0 /P 2 )×R，V＝V 1 +V 2 . The first time length T is the maximum time length of vacuumizing the explosion-proof housing 1 in the test, and the unit is S; v is the volume of the cavity to be extracted with air, V 1 For the volume of the internal cavity of the flameproof housing 1 (excluding the volume of the built-in system 2, i.e. the flameproof cavity), V 2 The volume of the cavity inside the pipeline (such as the first pipeline 7) communicated with the flameproof housing 1 is V, V 1 And V 2 The units of (a) are L; s is the rated pumping speed of the vacuumizing equipment 3, and the unit is L/S; p (P) 0 The unit is Pa for the initial pressure of the flameproof housing 1; p (P) 2 The extracted reaching pressure is expressed as Pa; r is an adjustment coefficient. The absolute pressure value of the flameproof housing 1 in the leak test of the built-in system 2 in the application should reach 0.1Pa, namely P 2 =0.1 Pa. Considering that the volume of the explosion-proof cavity can not be obtained accurately and the influence of other cavities in the pipeline, an adjusting coefficient R is set to eliminate the influence, and the R can take a value of 1.25; of course, in practical application, the vacuum pumping device can be arranged according toAnd (3) determining the value of R in the case of standby 3, the case of equipment to be tested and the like.
The first time length T may be calculated before starting the evacuation device 3.
And S4, if the absolute pressure in the flameproof housing 1 still does not reach 0.1Pa after the first time period T, judging that the leakage test of the built-in system 2 is not qualified.
In the case where the built-in system 2 is sealed well (leak performance is acceptable), the flameproof housing 1 can extract air to 0.1Pa in a period of time less than the first time period T. If the reading of the first pressure gauge 5 is still greater than 0.1Pa after the first time period T is exceeded, it is indicated that the built-in system 2 leaks gas into the flameproof housing 1 (it is determined that the sealing performance of the flameproof housing 1 is good), so that the leak test of the built-in system 2 can be directly determined to be failed.
And S5, after the absolute pressure in the explosion-proof housing 1 reaches 0.1Pa, continuously extracting the second duration by the vacuumizing device 3, and judging that the leakage test of the built-in system 2 is qualified if the absolute pressure in the explosion-proof housing 1 is not more than 0.1Pa in the second duration.
After the absolute pressure in the flameproof housing 1 reaches 0.1Pa, continuously acquiring the reading of the first pressure gauge 5, continuously extracting air in the flameproof housing 1 by the vacuumizing equipment 3 for a second duration, and judging that the leakage test of the built-in system 2 is qualified if the reading of the first pressure gauge 5 is not more than 0.1Pa in the time period of the second duration. If the first pressure gauge 5 has a reading greater than 0.1Pa for the duration of the second period of time, the built-in system 2 is judged to be out of the leak test.
The second time length can be 1% of the first time length T, and can also be determined according to the condition of the equipment to be tested and the parameters of the vacuumizing equipment 3.
After the test is finished, the high-pressure gas in the built-in system 2 and the vacuum in the flameproof housing 1 are slowly released.
Example 5: the object of this embodiment is to provide a leak test method of a system built in an explosion-proof enclosure, which is realized by using the leak test apparatus described in embodiment 2. The present example was modified on the basis of example 4 as follows:
the reading of the first pressure gauge 5 (i.e. the absolute pressure value inside the flameproof housing 1) can also be obtained by the upper computer, and the starting and closing of the evacuation device 3 can be controlled by the upper computer.
As shown in fig. 4, step S3 in this embodiment specifically includes:
s31, acquiring the initial pressure P in the explosion-proof housing 1 0 Starting the vacuumizing equipment 3 to extract air in the flameproof housing 1, and simultaneously acquiring the starting time T of the vacuumizing equipment 3 0 。
The upper computer obtains the initial pressure P in the current flameproof housing 1 by using a first pressure gauge 5 0 Then starting the vacuumizing device 3 to start to suck the air in the flameproof housing 1, and acquiring the current moment (the starting and sucking moment of the vacuumizing device 3) as T 0 。T 0 May be a time stamp.
S32, obtaining another time T 1 Absolute pressure P inside the time-proof enclosure 1 1 。
When the vacuumizing device 3 works for a period of time, the upper computer obtains that the current time is T 1 ，T 1 May be a time stamp; and the absolute pressure inside the current flameproof housing 1 is obtained to be P by utilizing the first pressure gauge 5 1 . At another time T 1 Can be selected in the first half of the vacuumizing process, such as T 1 ＝T 0 +300S。
S33, acquiring a first time length T.
(T 1 -T 0 )＝2.303×(V/S)×lg(P 0 /P 1 ) Wherein V is the volume of a cavity (comprising the volume of the explosion-proof cavity and the volume of a pipeline) of air to be extracted, and S is the rated extraction speed of the vacuumizing equipment 3. However, in practical application, the volume V cannot be accurately obtained, and the pumping speed S is also related to the working condition of the vacuum pumping device 3, so that the accurate values of V and S are not obtained in this step.
Conversion to V/s= (T) 1 -T 0 )/(lg(P 0 /P 1 ) X 2.303), followed by combining the calculation formula t=2.303× (V/S) x lg (P) of the first time period T in example 4 0 /P 2 ) X R, t= (T) 1 -T 0 )×R×lg(P 0 /P 2 )/lg(P 0 /P 1 ). Since this step eliminates the problem of inaccurate cavity volume, the adjustment factor R may only take a value slightly greater than 1, such as 1.1.
In the embodiment, when executing step S5, the upper computer can automatically determine whether the built-in system 2 passes the leakage test according to the reading of the first pressure gauge 5, specifically, the upper computer analyzes the recorded absolute pressure value, and if the first data is not greater than 0.1Pa and the other data is not greater than 0.1Pa in the second time period, the upper computer determines that the leakage test of the built-in system 2 is qualified.
Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present application without departing from the spirit and scope of the technical solution of the present application.
Claims (10)
1. A leak test method of a built-in system in an explosion-proof shell is characterized by comprising the following steps of: comprising the following steps:
s1, connecting vacuum equipment on an explosion-proof shell, and connecting a high-pressure air source on a built-in system;
s2, starting a high-pressure gas source to charge helium into the built-in system to 1kPa;
s3, acquiring initial pressure inside the explosion-proof shell, starting vacuumizing equipment to extract air inside the explosion-proof shell, and acquiring a first time length;
s4, if the absolute pressure in the explosion-proof housing still does not reach 0.1Pa after the first time period, judging that the built-in system leakage test is unqualified;
s5, after the absolute pressure in the explosion-proof housing reaches 0.1Pa, continuously extracting a second time period by the vacuumizing equipment, and judging that the built-in system leakage test is qualified if the absolute pressure in the explosion-proof housing is not more than 0.1Pa in the second time period; otherwise, judging that the built-in system leakage test is not qualified.
2. The leak test of a system built into an flameproof housing of claim 1The test method is characterized in that: the first time period T=2.303× (V/S) ×lg (P) 0 /P 2 )×R，V＝V 1 +V 2 Wherein V is 1 For the volume of the flameproof cavity, V 2 The inner volume of the pipeline communicated with the flameproof shell is S the pumping speed of the vacuumizing equipment, P 0 R is an adjustment coefficient and P is the initial pressure of the flameproof shell 2 Target pressure of extraction, P 2 ＝0.1Pa。
3. The leak test method of a system built in an explosion-proof enclosure according to claim 1, wherein: the step S3 is as follows:
s31, acquiring initial pressure in the explosion-proof housing, starting the vacuumizing equipment to extract air in the explosion-proof housing, and acquiring starting time of the vacuumizing equipment;
s32, acquiring the absolute pressure inside the explosion-proof shell at another moment;
s33, acquiring a first duration.
4. A leak test method for a system built into an explosion-proof enclosure according to claim 3, wherein: the first time period t= (T 1 -T 0 )×R×lg(P 0 /P 2 )/lg(P 0 /T 1 ) Wherein T is 1 For the other time T 0 P is the starting time of the vacuumizing equipment 0 For the initial pressure of the flameproof housing, P 1 For the other time T 1 The absolute pressure inside the flameproof shell is R is an adjustment coefficient and P 2 Target pressure of extraction, P 2 ＝0.1Pa。
5. The leak test method for a system built in an explosion-proof housing according to claim 4, wherein: the starting time T 0 And said another moment T 1 Are time stamps.
6. The leak test method of a system built in an explosion-proof enclosure according to claim 1, wherein: the second time period is 1% of the first time period.
7. The leak test method of a system built in an explosion-proof enclosure according to claim 1, wherein: the absolute pressure inside the explosion-proof shell is obtained by an absolute pressure gauge; the accuracy of the absolute pressure gauge is less than 0.1Pa.
8. The leak test method of the system built in the flameproof housing according to claim 7, wherein: the absolute pressure gauge is also used for transmitting the pressure value to the upper computer.
9. A leak test device of a built-in system in an explosion-proof shell is characterized in that: comprising the following steps: the vacuum-pumping device is communicated with the inside of the flameproof shell through a first pipeline, a high-pressure air source is communicated with the inside of the built-in system through a second pipeline, a first pressure gauge is used for monitoring the absolute pressure inside the flameproof shell, and a second pressure gauge is used for monitoring the absolute pressure inside the built-in system;
the minimum pressure of the vacuumizing equipment for vacuumizing is not more than 0.1Pa, the maximum pressure of the high-pressure air supply is not less than 1kPa, and the precision of the first pressure gauge is less than 0.1Pa.
10. The leak test apparatus of a system built into an explosion proof enclosure according to claim 9, wherein: the pressure meter further comprises an upper computer, wherein the upper computer is electrically connected with the first pressure meter and used for acquiring the pressure value of the first pressure meter.
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