CN111751062A - Method and device for testing gas leakage of containing cavity - Google Patents
Method and device for testing gas leakage of containing cavity Download PDFInfo
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- CN111751062A CN111751062A CN202010616075.8A CN202010616075A CN111751062A CN 111751062 A CN111751062 A CN 111751062A CN 202010616075 A CN202010616075 A CN 202010616075A CN 111751062 A CN111751062 A CN 111751062A
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- cavity
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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
- G01M3/32—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 for containers, e.g. radiators
- G01M3/3236—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 for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—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 for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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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
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
- G01M3/14—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/146—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a method and a device for testing gas leakage of a containing cavity, which comprises the following steps of; 1. measuring the volume V of the cavity, wherein the cavity is sealed, and after the air pressure of the gas in the cavity is kept stable, measuring the absolute pressure value P1 and the absolute temperature value T1 of the gas in the cavity; 2. after S seconds, measuring an absolute pressure value P2 and an absolute temperature value T2 of the gas in the cavity; 3. calculating the leakage rate M of the cavityXL，
Determining leakage rate M of the cavityXLAnd if the leakage is not greater than the maximum allowable leakage value, the cavity does not meet the sealing requirement, and if the leakage is not greater than the maximum allowable leakage value, the cavity meets the sealing requirement. Can determine the specific value of leakage, accurately control the test precision and accurately judgeWhether the leakage index of the blocking cavity meets the requirement or not.
Description
Technical Field
The invention belongs to the field of engine testing, and relates to a method and a device for testing gas leakage of a containing cavity.
Background
The air flow test of the parts of the aircraft engine is a complex process, and has many links which influence the test accuracy, such as whether a test bed and a test tool are leaked, whether an instrument and an instrument are in a normal working state and the like, and if the links have problems, the test accuracy is influenced. In the air flow test process of the engine parts, before the formal part test, the leakage test of the accommodating cavity for installing the parts is carried out, and whether the leakage index of the flow test bed meets the requirement or not is judged according to the test result.
The leakage condition of the previous cavity is performed by smearing soapy water at each connecting point of the cavity, the checked result only knows whether the leakage exists, the concept of a quantity value is not available, the accuracy is not accurate enough, the accuracy of the flow test of the part is not good, and whether the leakage index of the cavity meets the requirement cannot be judged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a device for testing gas leakage of a cavity, which can determine the specific value of leakage, accurately control the testing precision and accurately judge whether the leakage index of the cavity meets the requirement.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for testing gas leakage of a cavity comprises the following steps;
measuring the volume V of the cavity, sealing the cavity, and measuring the absolute pressure value P1 and the absolute temperature value T1 of the gas in the cavity after the gas pressure of the gas in the cavity is kept stable;
step two, after S seconds, measuring an absolute pressure value P2 and an absolute temperature value T2 of the gas in the cavity;
step three, calculating the leakage rate of the cavity
Determining leakage rate M of the cavityXLAnd if the leakage is not greater than the maximum allowable leakage value, the cavity does not meet the sealing requirement, and if the leakage is not greater than the maximum allowable leakage value, the cavity meets the sealing requirement.
Preferably, in the first step, gas is injected into the cavity under pressure until the pressure reaches a required set pressure value, and the pressure of the gas in the cavity is kept stable.
Preferably, in the first step, the gas in the cavity is kept stable for at least 80-100 s.
Preferably, in the second step, S is 50-70.
Preferably, in the second step, the absolute pressure value is measured by using a pressure sensor, and the absolute temperature value is measured by using a temperature sensor.
Preferably, in the second step, the maximum allowable leakage value is 0.1% of the part flow value.
Preferably, when the leakage rate of the cavity is MXLWhen the leakage is larger than the maximum allowable value of leakage, soapy water is smeared outside the cavity, and the bubbling position is the leakage point of the cavity.
A device for testing gas leakage of a cavity comprises the cavity, a valve, a pressure sensor and a temperature sensor;
the cavity is sealed by a sealing cover, the valve is arranged on the cavity and used for introducing and sealing gas, and the pressure sensor and the temperature sensor are arranged in the cavity.
Preferably, the accuracy grade of both the pressure sensor and the temperature sensor is less than or equal to 0.5%.
Preferably, the closure 1 is made of steel.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, the leakage rate of the cavity is calculated by measuring the absolute pressure value and the absolute temperature value in the cavity twice, so that the specific value of leakage can be determined, the test precision can be accurately controlled, the leakage of the cavity can be repaired in a targeted manner, and the leakage rate is compared with the maximum allowable leakage value, so that whether the cavity meets the sealing requirement or not is determined.
Furthermore, the leakage degree is judged by combining with a mode of smearing soapy water and knowing the specific leakage value of the leakage point on the basis of finding out the leakage point.
The device can introduce gas through the valve, measure the absolute pressure value and the absolute temperature value in the cavity by using the pressure sensor and the temperature sensor, and obtain the leakage rate of the cavity, thereby determining the specific value of leakage, accurately controlling the test precision, repairing the leakage of the cavity in a targeted manner and determining whether the cavity meets the sealing requirement.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus of the present invention.
Wherein: 1-sealing the cover; 2-a cavity; 3-a pipeline; 4-a valve; 5-a pressure sensor; 6-temperature sensor.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the device for testing gas leakage from a cavity of the present invention includes a sealing cover 1, a cavity 2, a pipe 3, a valve 4, a pressure sensor 5, and a temperature sensor 6.
The cavity is formed by a shell part, a pipeline part or a combination of the shell part and the pipeline part, the cavity 2 and the pipeline 3 jointly form the cavity in the embodiment, the cavity 2 and the pipeline 3 are communicated with each other, and when the volume of the cavity is measured, the volume of the cavity 2 and the volume of the pipeline 3 are added to obtain the volume.
One end of the cavity 2 is sealed by the sealing cover 1, the cavity 2 is connected with the sealing cover 1 through bolts, and the sealing cover 1 is made of steel, so that the sealing cover can adapt to a high-pressure environment and keeps good sealing performance.
Inside 3 one end intercommunication cavity 2 of pipeline, valve 4 is connected to the other end for let in and sealed gas, stop valve is chooseed for use to this embodiment valve 4, guarantees the gas tightness.
The method for testing the gas leakage of the cavity comprises the following steps.
Firstly, the absolute pressure P1 value and the absolute temperature T1 value of the cavity are measured.
Measuring the volume V of the cavity, opening the stop valve, introducing air into the cavity for pressurization until the pressure reaches a required set pressure value, closing the stop valve, waiting for 80-100 seconds for stabilization, and measuring an absolute pressure value P1 and an absolute temperature value T1 by using the pressure sensor 5 and the temperature sensor 6 on the cavity.
Secondly, testing the absolute pressure value P2 and the absolute temperature value T2 of the cavity.
And (3) using the pressure sensor 5 and the temperature sensor 6 on the cavity, and after S seconds, measuring the measured absolute pressure P2 value and the absolute temperature T2 value of the gas in the cavity, wherein S is 50-70.
And thirdly, calculating the leakage rate value of the cavity.
Calculating the leakage rate value M of the cavity according to the measured P1, T1, P2 and T2 and the volume V of the cavityXL. The calculation formula is as follows:
leakage rate of the chamber
In the formula, P1, P2, T1 and T2 are absolute pressure values and absolute temperature values in Pa and K degrees, respectively, and V is volume of the accommodating cavity in m3。
In general, the leakage rate of the cavity should be less than 0.1% of the maximum allowable leakage value, i.e. the component flow value, and the leakage rate M of the cavity is determinedXLAnd if the leakage is not greater than the maximum allowable leakage value, the cavity does not meet the sealing requirement, and if the leakage is not greater than the maximum allowable leakage value, the cavity meets the sealing requirement.
Fourthly, when leakage inspection is carried out, a method combining test and soapy water smearing is adopted to eliminate leakage until a leakage inspection symbolMeeting the requirements. If the leakage check is not satisfactory, the method of smearing soapy water at the connecting position of each test link is adopted, the connecting condition of the connecting point with bubbling is carefully checked, the connecting point is fastened again, then the soapy water is smeared for testing, and the leakage rate value M of the cavity is calculated according to the measured P1, T1, P2 and T2 and the volume V of the cavityXLAnd (4) until the product is qualified. The test accuracy of the flow tester can be ensured only when the cavity leakage value meets the requirement, and the accuracy and precision of formal parts tested by the used air flow test bed are ensured.
When implemented specifically.
Firstly, an absolute pressure value P1 and an absolute temperature value T1 of the cavity are measured.
The volume V of the measuring chamber is 0.0259m3And opening the stop valve, feeding air and pressurizing until the pressure reaches a required set pressure value, closing the stop valve, waiting for 90 seconds for stabilization, and measuring an absolute pressure value P1 of 184610.62Pa and an absolute temperature value T1 of 293.45 degrees K by using the pressure sensor 5 and the temperature sensor 6 on the cavity.
Secondly, measuring an absolute pressure value P2 and an absolute temperature value T2 of the cavity.
By using the pressure sensor 5 and the temperature sensor 6 on the cavity, after the absolute pressure value P1 and the absolute temperature value T160 seconds are measured, the absolute pressure value P2 is 181328.73Pa and the absolute temperature value T2 is 293.47 DEG K.
And thirdly, calculating the leakage rate value of the cavity. From the measured P1, T1, P2, T2 and the volume V of the chamber, the leakage rate value MXL of the chamber is calculated. The calculation formula is as follows:
leakage rate of the chamber
Measuring P1-184610.62 Pa, T1-293.45-K, P2-181328.73 Pa, T2-293.47-K and volume V0.0259 m in step one and two3Substituting into the leakage rate value MXL formula of the cavity, the leakage rate value MXL of the cavity can be obtained as 1.6881 × 10-5Kg/sec.
Typically, the vent of the chamberThe leakage rate should be less than 0.1% of the maximum allowable leakage value, i.e. the part flow value, which requires 0.15 kg/s, 0.1% of which, i.e. the maximum allowable leakage value, is 1.5 × 10-4Kilogram per second, and the value of the leakage rate MXL of the chamber is determined to be 1.6881 × 10-5Kilogram per second, is less than the maximum allowable value of leakage, so that the cavity meets the sealing requirement.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A method for testing gas leakage of a cavity is characterized by comprising the following steps;
measuring the volume V of the cavity, sealing the cavity, and measuring the absolute pressure value P1 and the absolute temperature value T1 of the gas in the cavity after the gas pressure of the gas in the cavity is kept stable;
step two, after S seconds, measuring an absolute pressure value P2 and an absolute temperature value T2 of the gas in the cavity;
step three, calculating the leakage rate M of the accommodating cavityXL，
Determining leakage rate M of the cavityXLAnd if the leakage is not greater than the maximum allowable leakage value, the cavity does not meet the sealing requirement, and if the leakage is not greater than the maximum allowable leakage value, the cavity meets the sealing requirement.
2. The method for testing gas leakage from a cavity according to claim 1, wherein in the first step, gas is injected into the cavity under pressure until the pressure reaches a desired set pressure value, and the pressure of the gas in the cavity is kept stable.
3. The method for testing gas leakage from a chamber according to claim 1, wherein in step one, the chamber is allowed to stand for at least 80-100s while the gas pressure of the gas in the chamber is kept stable.
4. The method for testing gas leakage from a chamber according to claim 1, wherein in step two, S is 50-70.
5. The method for testing gas leakage from a chamber according to claim 1, wherein in step two, the absolute pressure value is measured by using the pressure sensor (5), and the absolute temperature value is measured by using the temperature sensor (6).
6. The process for testing gas leakage from a chamber according to claim 1, wherein in step two, the maximum allowable leakage value is 0.1% of the part flow value.
7. The method for testing gas leakage from a chamber of claim 1, wherein the leakage rate M is measured as the chamber leakage rateXLWhen the leakage is larger than the maximum allowable value of leakage, soapy water is smeared outside the cavity, and the bubbling position is the leakage point of the cavity.
8. The device for testing the gas leakage of the cavity is characterized by comprising the cavity, a valve (4), a pressure sensor (5) and a temperature sensor (6);
the containing cavity is sealed by a sealing cover (1), a valve (4) is arranged on the containing cavity and used for introducing and sealing gas, and a pressure sensor (5) and a temperature sensor (6) are arranged in the containing cavity.
9. The apparatus for testing gas leakage from a chamber according to claim 8, wherein the pressure sensor (5) and the temperature sensor (6) each have a level of accuracy of 0.5% or less.
10. The apparatus for testing gas leakage from a container according to claim 8, wherein the cover 1 is made of steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010616075.8A CN111751062A (en) | 2020-06-30 | 2020-06-30 | Method and device for testing gas leakage of containing cavity |
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| CN202010616075.8A CN111751062A (en) | 2020-06-30 | 2020-06-30 | Method and device for testing gas leakage of containing cavity |
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| CN111751062A true CN111751062A (en) | 2020-10-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629779A (en) * | 2020-12-15 | 2021-04-09 | 西安交通大学 | Total air tightness detection method for pressure container |
| CN114577409A (en) * | 2020-11-30 | 2022-06-03 | 宝能汽车集团有限公司 | Detection method and detection system for hydrogen leakage rate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577409A (en) * | 2020-11-30 | 2022-06-03 | 宝能汽车集团有限公司 | Detection method and detection system for hydrogen leakage rate |
| CN112629779A (en) * | 2020-12-15 | 2021-04-09 | 西安交通大学 | Total air tightness detection method for pressure container |
| CN112629779B (en) * | 2020-12-15 | 2021-09-07 | 西安交通大学 | Total air tightness detection method for pressure container |
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