CN107340101B - Gas micro-leakage detection device and method for sealing device - Google Patents

Gas micro-leakage detection device and method for sealing device Download PDF

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Publication number
CN107340101B
CN107340101B CN201710531104.9A CN201710531104A CN107340101B CN 107340101 B CN107340101 B CN 107340101B CN 201710531104 A CN201710531104 A CN 201710531104A CN 107340101 B CN107340101 B CN 107340101B
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leakage
sealing
vacuum degree
vacuum
sealing device
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CN107340101A (en
Inventor
张家远
王利恒
顾健
吴瑕
安敏
吕成龙
庄成乾
张昕
苏鑫
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Beijing Changcheng Institute of Metrology and Measurement AVIC
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Beijing Changcheng Institute of Metrology and Measurement AVIC
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/025Details with respect to the testing of engines or engine parts

Abstract

The invention discloses a device and a method for evaluating micro gas leakage of a sealing device, and belongs to the field of leakage testing of sealing devices. The device comprises a cavity, a sealing device, vacuumizing equipment, a vacuum meter, a vacuum display and a computer. The cavity is connected with the sealing device through a connecting joint, the cavity is connected with the vacuum meter through the connecting joint, and the cavity is connected with the vacuumizing equipment through the connecting joint. The vacuum meter and the vacuum display are connected through a cable, and the vacuum display is connected with the computer through a cable. The connecting joint is provided with a stop valve. The vacuum pumping equipment is connected with the computer through a cable. The computer is provided with vacuum degree testing and analyzing software and vacuumizing control software. Also discloses a method for evaluating the gas micro-leakage of the sealing device based on the gas micro-leakage evaluating device. The invention provides a device and a method for testing and evaluating the sealing performance of a sealing device, which have the advantages of high testing precision, high sensitivity and adjustable sensitivity and can give quantitative results for micro-leakage conditions.

Description

Gas micro-leakage detection device and method for sealing device
Technical Field
The invention relates to a sealing device gas micro-leakage detection device and method, in particular to a sealing device gas micro-leakage detection device and method applied to an aircraft engine, and belongs to the field of sealing device leakage testing and evaluation methods.
Background
In the research of the sealing technology of the aeroengine, the development and the production of the sealing device, the problem of the evaluation of the sealing performance is involved, and particularly, the air tightness characteristics of the sealing device (such as an end face sealing device, a circumference sealing device and the like) are required to be detected and tested. The air-tight characteristic detection and test work of the sealing device is carried out, the sealing performance is evaluated by mainly adopting a method of counting bubbles in the prior art, and the sealing performance of a product is considered to be qualified when the number of the bubbles does not exceed the appointed number within the specified time (for example, the number of the bubbles of the sealing device of an aircraft engine of a certain model is required to be less than 10 within 5 minutes). The device corresponding to the detection and test method comprises the following steps: the standard origin, the standard gas tank, the standard air filter, the standard switch, the standard pressure gauge 1, the standard pressure gauge 2, the air inlet end sealing cavity, the sealing device, the air outlet end sealing cavity, the connecting pipe and the beaker are shown in figure 1.
The method for counting bubbles and the corresponding device have the problem of insufficient test precision when evaluating the leakage condition of the sealing device, for example, the bubbles of different sealing devices or the same device have different sizes under different conditions, and the number of the bubbles can only give qualitative leakage state evaluation but cannot give accurate leakage quantity values.
With the advancement of the aircraft engine technology, higher requirements are put forward on the development and production of sealing devices and the research on test technologies thereof. In the field of aeroengine seals, there is an increasing demand for technical research to improve sealing performance and for the development and production of micro-leak seals. These demands objectively require the study of a method and apparatus for testing the amount of micro-leakage and high accuracy, and the evaluation of the performance of a sealing device using the method and apparatus.
Disclosure of Invention
The invention discloses a device and a method for detecting micro-leakage of gas in a sealing device, and aims to provide a device and a method for testing the sealing performance of the sealing device of an aircraft engine, which have the advantages of high testing precision, high sensitivity and adjustable sensitivity and can give quantitative results for the micro-leakage condition.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a sealing device gas micro-leakage detection device which comprises a cavity, a sealing device, vacuumizing equipment, a vacuum meter, a vacuum display and a computer. The vacuum cavity is connected with the vacuum meter through the connecting joint, and the vacuum cavity is connected with the vacuum pumping equipment through the connecting joint. The vacuum meter and the vacuum display are connected through a cable, and the vacuum display is connected with the computer through a cable. The connecting joint is provided with a stop valve. The vacuum pumping equipment is connected with the computer through a cable. The computer is provided with vacuum degree testing and analyzing software and vacuumizing control software.
The vacuum degree testing and analyzing software has the following two functions: firstly, making a vacuum degree-time relation curve, and storing a data file of the vacuum degree and corresponding time; and performing characteristic calculation and extraction on a vacuum degree-time curve, wherein the characteristic calculation and extraction comprises a curve fitting function, a tangent slope, a secant slope and a curve trapezoidal area calculation function, and the sealing performance of the sealing device is inspected and evaluated according to the characteristic parameters. And (II) a function of calculating a gas leak rate (moles/second) over a selected time period.
The vacuumizing control software has the following functions: and sending a command by the vacuumizing control software to control the vacuumizing equipment to discharge the air in the cavity out of the cavity through the connecting joint.
When the evaluation device works, the stop valve on the connecting joint is opened, the vacuumizing control software installed on a computer is opened, and the vacuumizing control software controls the vacuumizing equipment to discharge air in the cavity out of the cavity through the connecting joint. When the vacuum display displays that the vacuum degree is a preset pressure value, the stop valve on the connecting joint is closed, and gas is ensured not to reversely flow in. The air outside the cavity enters the cavity only through the end face sealing surface and the circumferential sealing surface of the sealing device by leakage, so that the change of the vacuum degree is caused, the sealing performance of the sealing device is tested and evaluated by adopting a vacuum degree method, and the end face sealing surface and the circumferential sealing surface are leakage air inlets. And running vacuum degree testing and analyzing software for evaluating the sealing device of the computer, and recording a relation curve of the vacuum degree and the time and corresponding data. The length of the test time is determined according to the test requirements of the sealing device of the aircraft engine. And extracting characteristic parameters according to a relation curve of the vacuum degree and the time to test and evaluate the sealing characteristic of the aircraft engine sealing device.
The vacuum display displays the preset pressure value of the vacuum degree, and preferably 0.008 Pa.
The method for testing and evaluating the sealing performance of the sealing device by adopting the vacuum degree comprises the following specific steps: and calculating the leakage amount of any time period within the preset time according to the relation curve of the vacuum degree and the time. The relation curve of the vacuum degree and the time is obtained by fitting according to test data, namely the relation expression of the vacuum degree P and the time T is P ═ f (T), and the relation of the gas temperature T in the cavity in the test process and the time T is T ═ phi (T) by fitting according to the test data. From this, t is obtained1The leakage rate (unit is expressed by mol/sec) into the cavity 1 through the end face sealing face and the circumferential sealing face of the sealing device in the period t) is shown as formula 1).
In formula 1)
Substituting formulae 2) and 3) into formula 1) to obtain formula 4)
The leakage rate of the sealing device was obtained according to equation 4) in combination with the test data.
The leakage rate of any time period in the preset time is calculated according to the relation curve of the vacuum degree and the time, quantitative leakage rate data are provided for the development of the sealing device of the aircraft engine, the leakage performance of the sealing device to be installed on the aircraft engine is evaluated, and quantitative reference is provided for the selection of engines installed on different manufacturers and different batches of products.
Under the condition that the temperature is kept unchanged, bubbles can be observed in the water container by the existing sealing leakage method, the volume of one bubble leaked by the existing sealing leakage evaluation method is set for comparison, and a vacuum degree result table is obtained by calculation according to the volumes of different cavities and the volume of one bubble leaked by the existing sealing leakage method. The volumes of different cavities are different in vacuum degree change value under the condition that the volumes of the cavities correspond to the volumes of bubbles in the existing sealing leakage evaluation method, and the larger the volume is, the smaller the vacuum degree change is; conversely, the smaller the volume, the greater the change in vacuum. The sensitivity of the leakage test can be adjusted by selecting the proper cavity volume aiming at different aeroengine sealing devices, the proper sensitivity is adjusted, and a high-precision leakage test result is given.
Has the advantages that:
1. the gas micro-leakage detection device of the sealing device disclosed by the invention has the advantages of simple structure and easiness in implementation.
2. Compared with the existing sealing leakage evaluation method for a plurality of bubbles, the gas micro-leakage detection device and method for the sealing device disclosed by the invention can quantitatively evaluate the quality of the sealing device based on the vacuum degree-time relation curve obtained by testing, and in addition, the sensitivity of leakage quantity testing can be adjusted by selecting proper cavity volume aiming at different aeroengine sealing devices, so that the device has the advantages of high testing precision, high sensitivity and adjustable sensitivity, and can give quantitative results for micro-leakage conditions.
3. The invention discloses a device and a method for detecting the micro-leakage of gas of a sealing device, which can give quantitative results to the micro-leakage condition of the sealing device of an aeroengine, have positive supporting effect on the research, test and evaluation of the sealing device of the aeroengine, and provide an effective performance comparison means and a method for the installation of an aeroengine accessory (the sealing device).
Drawings
FIG. 1 illustrates a prior art leak testing method and corresponding apparatus for a sealing device in the background art;
fig. 2 is a schematic view of a gas micro-leakage detection device of a sealing device disclosed by the invention.
Detailed Description
To better illustrate the objects and advantages of the present invention, the following further description is made with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 2, the sealing device gas micro-leakage detection device disclosed in this embodiment includes a cavity 1, a sealing device 2, a vacuum pumping device 5, a vacuum gauge 7, a vacuum display 9, and a computer 14. The vacuum gauge 7 and the vacuum display 9 adopt a microcomputer type digital display composite vacuum gauge manufactured by Chengdu Zhenghua electronic instruments and are numbered as ZDF-X-LED. The vacuum chamber is characterized in that the chamber 1 is connected with the sealing device 2 through a connecting joint 8, the chamber 1 is connected with the vacuum meter 7 through a connecting joint 6, and the chamber 1 is connected with the vacuumizing device 5 through a connecting joint 3. The vacuum gauge 7 is connected with the vacuum display 9 through a cable 10, and the vacuum display 9 is connected with a computer 14 through a cable 11. And a stop valve is arranged on the connecting joint 3. The vacuum-pumping device 5 is connected with the computer 14 through a cable 12. The computer 14 is provided with vacuum degree testing and analyzing software and vacuumizing control software.
The vacuum degree testing and analyzing software has the following two functions: firstly, making a vacuum degree-time relation curve, and storing a data file of the vacuum degree and corresponding time; and performing characteristic calculation and extraction on a vacuum degree-time curve, wherein the characteristic calculation and extraction comprises a curve fitting function, a tangent slope, a secant slope and a curve trapezoidal area calculation function, and the sealing performance of the sealing device is inspected and evaluated according to the characteristic parameters. And (II) a function of calculating a gas leak rate (moles/second) over a selected time period.
The vacuumizing control software has the following functions: the vacuumizing control software sends a command to control the vacuumizing equipment 5 to discharge the air in the cavity 1 out of the cavity through the connecting joint 3.
When the method for detecting the micro gas leakage of the sealing device is implemented based on the device for detecting the micro gas leakage of the sealing device disclosed by the invention, in the working process, the stop valve on the connecting joint 3 is opened, the vacuumizing control software installed on the computer 14 is opened, and the vacuumizing equipment 5 is controlled by the vacuumizing control software to discharge the air in the cavity 1 out of the cavity through the connecting joint 3. When the vacuum display 9 shows that the vacuum degree is 0.008Pa, the stop valve on the connecting joint 3 is closed, and the gas is ensured not to reversely flow in. The external air of the cavity 1 enters the cavity 1 only through the end face sealing surface and the circumferential sealing surface of the sealing device 2 through leakage, so that the change of the vacuum degree is caused, the sealing performance of the sealing device is tested and evaluated by adopting a vacuum degree method, and the circumferential sealing surface and the end face sealing surface are the leakage air inlet 4. Vacuum degree testing and analyzing software for evaluating the sealing device of the computer 14 is operated, and a relation curve of the vacuum degree and the time and corresponding data are recorded. The length of the test time is determined according to the test requirements of the sealing device of the aircraft engine. And extracting characteristic parameters according to the relation curve of the vacuum degree and the time to test and detect the sealing characteristic of the sealing device of the aircraft engine.
If testing and detecting are to be carried out on the end face sealing device of a certain type of aero-engine, the end face sealing device is arranged at the position of the sealing device 2 of the device through a special tool, and vacuumizing control software arranged on a computer 14 sends a command to control vacuumizing equipment 5 to discharge air in a cavity 1 out of the cavity through a connecting joint 3. When the vacuum display 9 displays that the vacuum degree is 0.008Pa, the stop valve on the connecting joint 3 is closed to ensure that the gas cannot reversely flow in. And operating a computer 14 vacuum degree test and analysis software, storing vacuum degree-time relation data, setting the sampling time to be 10 minutes, setting the sampling frequency to be 10 seconds, displaying a vacuum degree-time relation curve on the vacuum degree test and analysis software, and reflecting the sealing performance of the aero-engine end face sealing device by the corresponding vacuum degree of 5 minutes on the curve, wherein the large indication value of the vacuum degree indicates that the sealing performance of the sealing device product is poor, and otherwise, the small indication value of the vacuum degree indicates that the sealing performance of the sealing device product is excellent.
The method for testing and detecting the sealing performance of the sealing device by adopting the vacuum degree comprises the following specific steps: and calculating the leakage amount in any time period within 10 minutes according to the relation curve of the vacuum degree and the time, and providing quantitative leakage amount data for the development of the sealing device of the aircraft engine. And setting a vacuum degree-time curve in the cavity 1 obtained through the test, wherein the vacuum degree-time curve is obtained through fitting according to test data, namely a relation between the vacuum degree P and the time T is P (f) (T), and the relation between the gas temperature T in the cavity in the test process and the time T is T (T) through fitting according to the test data. From this, t can be obtained1The leakage rate (unit is expressed by mol/sec) into the cavity 1 through the end face sealing face and the circumferential sealing face of the sealing device in the period t) is shown as formula 1).
In formula 1)
Substituting formulae 2) and 3) into formula 1) to obtain formula 4)
The leakage rate of the sealing device was obtained according to equation 4) in combination with the test data.
Under the condition that the temperature is kept unchanged, bubbles can be observed in the water container by the existing sealing leakage detection method, for the convenience of comparison, the volume of one bubble (the bubble diameter is assumed to be 4mm, and the pressure is assumed to be 1 atmospheric pressure) leaked by the corresponding existing method is set, and the vacuum degree results obtained by calculation aiming at the volumes of different cavities 1 are shown in the following table 1.
TABLE 1 leakage of one bubble Cavity vacuum variation
Table 1 the results show that: different cavity volumes are different in vacuum degree change value under the condition that the volumes of the cavities correspond to the volumes of bubbles in the existing sealing leakage detection method, and the larger the volume is, the smaller the vacuum degree change is; conversely, the smaller the volume, the greater the change in vacuum. Therefore, the sensitivity of the method and the device for testing the leakage quantity is adjustable, and the proper cavity volume can be selected for different aircraft engine sealing devices, so that the proper sensitivity and the high-precision leakage quantity test result are provided.
As can be seen from table 1, the sealing device gas micro-leakage evaluation device and the detection method disclosed in the present embodiment can be applied to the condition that only one bubble leakage volume is provided according to the conventional detection method, even when the volume of the chamber 1 is large (21205750.412 mm)3) In this case, the sensitivity was also high, reaching 0.1596 Pa.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (4)

1. A method for detecting micro gas leakage of a sealing device adopts a leakage detection device which comprises a cavity (1), a sealing device (2), vacuumizing equipment (5), a vacuum meter (7), a vacuum display (9) and a computer (14); the vacuum cavity is characterized in that the cavity (1) is connected with the sealing device (2) through a connecting joint (8), the cavity (1) is connected with the vacuum meter (7) through a connecting joint (6), and the cavity (1) is connected with the vacuumizing equipment (5) through a connecting joint (3); the vacuum meter (7) is connected with the vacuum display (9) through a cable (10), and the vacuum display (9) is connected with the computer (14) through a cable (11); a stop valve is arranged on the connecting joint (3); the vacuum pumping equipment (5) is connected with the computer (14) through a cable (12); the computer (14) is provided with vacuum degree testing and analyzing software and vacuumizing control software; the method is characterized in that:
the detection method for the micro gas leakage of the sealing device comprises the following steps: when the vacuum pump works, the stop valve on the connecting joint (3) is opened, the vacuumizing control software installed on the computer (14) is opened, and the vacuumizing control software controls the vacuumizing equipment (5) to discharge air in the cavity (1) out of the cavity through the connecting joint (3); when the vacuum display (9) displays that the vacuum degree is a preset pressure value, the stop valve on the connecting joint (3) is closed to ensure that the gas cannot reversely flow in; the external air of the cavity (1) enters the cavity (1) only through the end face sealing surface and the circumferential sealing surface of the sealing device (2) through leakage, so that the change of the vacuum degree is caused, the sealing performance of the sealing device is tested and evaluated by adopting a vacuum degree method, and the circumferential sealing surface and the end face sealing surface are leakage air inlets (4); operating vacuum degree testing and analyzing software for evaluating a sealing device of a computer (14), and recording a relation curve of the vacuum degree and time and corresponding data; the length of the test time is determined according to the test requirements of the sealing device of the aircraft engine; extracting characteristic parameters according to a relation curve of vacuum degree and time to test and evaluate the sealing characteristic of the aeroengine sealing device;
the method for testing and evaluating the sealing performance of the sealing device by adopting the vacuum degree comprises the following specific implementation method,
calculating the leakage amount of any time interval section within preset time according to the relation curve of the vacuum degree and the time; the relation curve of the vacuum degree and the time is obtained by fitting according to test data, namely the relation of the vacuum degree P and the time T is P ═ f (T), and the relation of the gas temperature T in the cavity in the test process and the time T is T ═ phi (T) by fitting according to the test data; from this, t is obtained1The leakage rate of the end face sealing face and the circumferential sealing face of the sealing device into the cavity (1) in the time period t
As shown in formula 1);
in formula 1)
Substituting formulae 2) and 3) into formula 1) to obtain formula 4)
Obtaining the leakage rate of the sealing device according to the formula 4) by combining the test data;
under the condition that the temperature is kept unchanged, because the existing sealing leakage detection method can observe bubbles in the water container, for the convenience of comparison, the volume of leaking one bubble corresponding to the existing sealing leakage evaluation method is set, and a vacuum degree result table is obtained by calculation according to the volumes of different cavities (1) and the volume of leaking one bubble by the existing sealing leakage method; the volume of different cavities (1) is different in vacuum degree change value under the condition that the volumes of the different cavities correspond to the volume of one bubble of the existing sealing leakage evaluation method, and the larger the volume is, the smaller the vacuum degree change is; conversely, the smaller the volume, the larger the change of the vacuum degree; the sensitivity of the leakage test is adjustable by selecting proper cavity volume aiming at different aeroengine sealing devices, the proper sensitivity is adjusted, and the leakage test result is given.
2. The method of claim 1, wherein the step of detecting the micro-leakage of the gas from the sealing device comprises the steps of: the vacuum degree testing and analyzing software has the following functions: making a vacuum degree-time relation curve, and storing a data file of the vacuum degree and the corresponding time; carrying out characteristic calculation and extraction on a vacuum degree-time curve, wherein the characteristic calculation and extraction comprises a curve fitting function, a tangent slope, a secant slope and a curve trapezoidal area calculation function, and inspecting and evaluating the sealing performance of the sealing device according to the characteristic parameters; a function of calculating a gas leak rate over a selected time period;
the vacuumizing control software has the following functions: the vacuumizing control software sends out a command to control the vacuumizing equipment (5) to discharge the air in the cavity (1) out of the cavity through the connecting joint (3).
3. The method of detecting a gas microleakage in a sealed device according to claim 2, wherein: the vacuum display (9) displays that the vacuum degree is 0.008Pa when the preset pressure value is selected.
4. A method of detecting a gas microleakage in a sealed device, as defined in claim 3, wherein: the leakage rate of any time period in the preset time is calculated according to the relation curve of the vacuum degree and the time, quantitative leakage rate data are provided for the development of the sealing device of the aircraft engine, the leakage performance of the sealing device to be installed on the aircraft engine is evaluated, and quantitative reference is provided for the selection of engines installed on different manufacturers and different batches of products.
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CN110319985B (en) * 2018-03-29 2021-01-12 长城汽车股份有限公司 Detection system and detection method
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