A device and method for detecting leakage of an aeronautical seal life test

Abstract

This application relates to the field of sealing ring testing technology, specifically to a device and method for detecting leakage during aviation seal life testing. The testing device includes a testing chamber, a testing fixture, a drive assembly, an oil guide pipe, an oil collection cup, and a testing balance. The testing chamber is a sealed chamber; the testing fixture is located inside the testing chamber; the drive assembly is connected to a piston rod; the drive assembly drives the piston rod to perform linear reciprocating motion; the upper end of the oil guide pipe covers the leak port; the lower end of the oil guide pipe passes through the inside of the oil collection cup; the oil collection cup is placed on the weighing platform of the testing balance; the testing fixture, oil guide pipe, oil collection cup, and testing balance are arranged vertically from top to bottom; this solves the problems of poor timeliness and low testing accuracy in sealing ring testing devices.

Description

Technical Field

[0001] This application relates to the field of sealing ring testing technology, and more specifically, to a device and method for detecting leakage during aviation seal life testing. Background Technology

[0002] In the application of aviation hydraulic products, linear reciprocating rubber and plastic seals require specialized life verification tests before practical application to ensure their reliability and service life. Among these tests, the high-temperature life test for linear reciprocating seals is a core verification item. This test simulates actual working conditions to continuously assess the sealing performance of the seals. Real-time, in-situ, and accurate detection of seal leakage during the test is a crucial technical step in obtaining seal life data and determining seal failure status. The test results directly determine the effectiveness and accuracy of the rubber and plastic seal life verification test. For the leakage detection stage of this test, a combination of container collection and manual observation is mainly used. Small beakers are used as collection containers to collect the leaked oil during the test, and then test personnel visually observe the leaked oil to detect and determine the leakage amount. This method is currently the mainstream implementation method for leakage detection in the high-temperature life test of linear reciprocating seals for aviation hydraulic products.

[0003] However, the current leakage detection method uses a small beaker for collection and visual observation. After the oil leaks, it needs to accumulate in the beaker before being manually observed and judged. This process has a detection lag, and factors such as the amount of oil accumulated and the observation angle can affect the judgment result, making real-time response impossible. Furthermore, visual observation can only make qualitative judgments and cannot quantify and accurately measure the leakage amount. Human observation errors are significant, resulting in technical problems such as poor timeliness and low detection accuracy of the detection device. This fails to meet the technical requirements of real-time, in-situ, accurate detection in linear reciprocating seal high-temperature life tests. Summary of the Invention

[0004] To address the issues of poor timeliness and low detection accuracy in sealing ring testing devices, this application provides a device and method for detecting leakage during aviation seal life testing.

[0005] In a first aspect, this application provides a device for detecting leakage during an aviation seal life test, comprising:

[0006] The testing chamber is a sealed chamber;

[0007] A test fixture is located inside the testing chamber; the test fixture includes a fixed sleeve and a piston rod; the piston rod is slidably assembled inside the fixed sleeve; a sealing ring is fixedly disposed on the inner wall of the fixed sleeve, and the piston rod slides in cooperation with the sealing ring; the fixed sleeve has an oil leakage port; the oil leakage port is located below the fixed sleeve;

[0008] A drive assembly is connected to the piston rod; the drive assembly is used to drive the piston rod to perform linear reciprocating motion.

[0009] An oil guide pipe, the upper end of which is fitted under the oil leak port;

[0010] An oil collecting cup, with the lower end of the oil guide pipe passing through the inside of the oil collecting cup;

[0011] The testing balance has an oil collection cup placed on its weighing platform; the testing fixture, the oil guide pipe, the oil collection cup, and the testing balance are arranged vertically from top to bottom.

[0012] Optionally, the testing device further includes a temperature control component; the temperature control component is used to regulate and maintain the temperature inside the testing chamber at a preset test temperature.

[0013] Optionally, the inner diameter of the oil guide tube is greater than a preset diameter but less than twice the preset diameter; wherein, the preset diameter is the diameter of a single drop of oil at the test temperature.

[0014] Optionally, the detection balance is located outside the detection chamber; the bottom of the detection chamber is provided with a sealing through hole, and the lower end of the oil guide pipe extends through the sealing through hole to the outside of the detection chamber and is connected to the oil collection cup; the diameter of the sealing through hole is adapted to the diameter of the oil guide pipe.

[0015] Optionally, the oil guide pipe includes a pipe body and an oil collecting funnel; the pipe body and the oil collecting funnel are connected; the oil collecting funnel is sealed and abuts against the oil leak; the oil collecting cup is connected to the lower end of the pipe body; the oil collecting funnel is used to collect oil dripping from the oil leak.

[0016] Secondly, this application provides a method for detecting leakage in an aviation seal life test, applied to the aviation seal life test leakage detection device described in the first aspect, the detection method comprising:

[0017] Install the sealing ring to be tested onto the inner wall of the fixing sleeve;

[0018] Install the testing fixture into the testing chamber and seal the testing chamber;

[0019] Install oil guide pipe;

[0020] The start-up drive assembly drives the piston rod to perform linear reciprocating motion, accumulating the test duration;

[0021] When the test duration is less than the first preset duration, the change in the number of leaked oil droplets is detected;

[0022] When the test duration exceeds the first preset duration, the weight change of the leaked oil droplets is detected;

[0023] When the drive assembly drives the piston rod to move for a second preset duration, the drive assembly is controlled to stop working; wherein the second preset duration is longer than the first preset duration.

[0024] Optionally, when the test duration is less than a first preset duration, detecting the change in the number of leaked oil droplets includes:

[0025] The weight of a single drop of oil is determined based on the size of the leak and the type of oil, and the weight of the single drop of oil is set as a preset weight.

[0026] When oil drips into the oil collection cup, the weight of the oil collection cup is measured in real time by a detection balance. When the detected single weight increase is greater than 50% of the preset weight, it is determined as a valid leak and the number of oil drips is accumulated.

[0027] Optionally, the installation of the oil guide pipe includes:

[0028] The diameter of a single drop of oil is determined based on the size of the leak and the type of oil.

[0029] The inner diameter of the oil guide tube is determined based on the diameter of the single drop of oil; wherein the inner diameter of the oil guide tube is greater than a preset diameter but less than twice the preset diameter, and the preset diameter is the diameter of the single drop of oil at the test temperature;

[0030] Select the oil guide pipe according to the determined inner diameter of the oil guide pipe, and install the oil guide pipe.

[0031] Optionally, the step of selecting the oil guide pipe according to the determined inner diameter of the oil guide pipe and installing the oil guide pipe includes:

[0032] Select the oil guide pipe according to the determined inner diameter of the oil guide pipe;

[0033] The inner circumferential wall of the oil guide tube is lubricated;

[0034] The oil guide tube is swung until the number of oil droplets falling within a preset time period is 0, so as to form an oil film and complete the lubrication.

[0035] Once the oil guide tube has been lubricated, install the oil guide tube.

[0036] Optionally, when the oil guide tube has completed lubrication, installing the oil guide tube includes:

[0037] Once the oil guide tube has been lubricated, it is weighed to obtain a first weight.

[0038] Install the weighed oil guide pipe;

[0039] The detection method further includes:

[0040] When the test duration reaches the third preset duration, the oil guide pipe and the leaked oil are weighed to obtain a second weight; wherein, the second weight is the sum of the weights of the oil guide pipe and the oil; the third preset duration is greater than or equal to the second preset duration;

[0041] The total weight of the oil leak is determined based on the difference between the second weight and the first weight.

[0042] To address the issues of poor timeliness and low detection accuracy in sealing ring testing devices, this application offers the following advantages:

[0043] By employing a sealed testing chamber, a test fixture with an internal fixed sleeve and piston rod, and a drive assembly, the actual working state of the seal ring under test can be simulated, enabling the seal ring to achieve linear reciprocating motion within the testing chamber. A leaking port is located below the fixed sleeve, along with an oil guide pipe sealingly abutting the leaking port and an oil collection cup connected to the guide pipe, allowing the leaking oil to flow directionally into the collection cup. By placing the collection cup on the weighing platform of a testing balance, the leaking oil in the collection cup can be weighed in real time, thus obtaining the number of drops. Through the coordinated arrangement of these structures, directional collection and real-time quantitative detection of the leaking oil can be achieved, thereby improving the response speed and data accuracy of leak detection. Ultimately, this solves the problems of poor timeliness and low detection accuracy in testing devices, enabling efficient and accurate detection of leaks in aviation seal life tests. Attached Figure Description

[0044] Figure 1 A schematic diagram of the leakage detection device for the aviation seal life test of Embodiment 1 is shown;

[0045] Figure 2 It shows Figure 1 A schematic diagram of the test fixture for detecting leakage in an aviation seal life test.

[0046] Figure 3 A schematic diagram of the method for detecting leakage in the aviation seal life test according to Example 2 is shown.

[0047] Reference numerals: 10 test chamber; 20 test fixture; 21 fixed sleeve; 22 piston rod; 23 oil leak port; 30 drive assembly; 40 oil guide pipe; 41 pipe body; 42 oil collecting funnel; 50 oil collecting cup; 60 test balance; 70 constant temperature assembly; 80 sealing through hole; 90 sealing ring. Detailed Implementation

[0048] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0049] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0050] In aviation seal life tests, the detection of leakage in the sealing ring 90 is currently done solely by collecting the leaking oil in a small beaker and visually observing it. Relying solely on manual visual observation cannot provide real-time data acquisition and quantification, leading to data lag and significant human error. Consequently, existing detection devices suffer from poor timeliness and low accuracy, failing to meet the demand for precise leakage detection in aviation seal life tests. To address this issue, this application provides a device and method for detecting leakage in aviation seal life tests.

[0051] Example 1:

[0052] In this embodiment, a device for detecting leakage during aviation seal life testing is provided, such as... Figure 1 , Figure 2 As shown, the testing device includes a testing chamber 10, a testing fixture 20, a drive assembly 30, an oil guide pipe 40, an oil collection cup 50, and a testing balance 60.

[0053] The testing chamber 10 is a sealed chamber. The sealed testing chamber 10 can isolate the test process from external airflow, dust and other environmental factors, maintain the stability of the test environment, and provide a basic guarantee for accurately simulating the actual working state of the sealing ring 90.

[0054] The test fixture 20 is located inside the testing chamber 10. The test fixture 20 is used to mount and fix the sealing ring 90 to be tested. The test fixture 20 includes a fixed sleeve 21 and a piston rod 22. The piston rod 22 is slidably fitted inside the fixed sleeve 21, and the sealing ring 90 is fixedly disposed on the inner wall of the fixed sleeve 21. The piston rod 22 and the sealing ring 90 are in sliding engagement. The sliding engagement between the piston rod 22 and the sealing ring 90 simulates the reciprocating sealing condition of the sealing ring 90 in actual use of aviation equipment. The fixed sleeve 21 has an oil drain port 23 located at the bottom of the fixed sleeve 21. This allows leaked oil to flow out naturally under gravity, preventing oil accumulation and residue inside the fixed sleeve 21, and ensuring that all leaked oil is collected and tested.

[0055] The drive assembly 30 is connected to the piston rod 22. The drive assembly 30 is used to drive the piston rod 22 to perform linear reciprocating motion. The drive assembly 30 provides a stable power output to the piston rod 22, enabling the piston rod 22 to perform linear reciprocating motion according to a set frequency and stroke. Together with the test chamber 10 and the test fixture 20, it simulates the actual working state of the seal ring 90 under test, ensuring the consistency between the test conditions and the actual operating conditions.

[0056] The upper end of the oil guide pipe 40 is covered below the oil leak port 23, which can prevent leaked oil from seeping from the connection and ensure that all oil flowing out of the oil leak port 23 can enter the oil guide pipe 40, avoiding the detection result being too low due to oil loss and improving the accuracy of the detection.

[0057] The lower end of the oil guide pipe 40 passes through the inside of the oil collection cup 50. The oil collection cup 50 is used to collect and store the leaked oil flowing out of the oil guide pipe 40, providing a collection medium for subsequent quantitative detection of the leakage amount.

[0058] The oil collection cup 50 is placed on the weighing platform of the testing balance 60. The testing fixture 20, the oil guide pipe 40, the oil collection cup 50, and the testing balance 60 are arranged vertically from top to bottom. Through this vertical arrangement, the leaking oil can flow sequentially through the oil guide pipe 40 and into the oil collection cup 50 by gravity. The testing balance 60 can weigh the oil collection cup 50 in real time to obtain the weight data of the leaking oil and calculate the number of oil drops, thereby effectively improving the timeliness and accuracy of leak detection.

[0059] This embodiment simulates the actual working state of the sealing ring 90 under test, enabling it to achieve linear reciprocating motion within the test chamber 10. A leaking oil port 23 is located below the fixed sleeve 21, along with an oil guide pipe 40 that seals against the port 23 and an oil collection cup 50 connected to the guide pipe 40. This allows the leaking oil to be directed into the collection cup 50. By placing the collection cup 50 on the weighing platform of the test balance 60, the leaking oil within the cup can be weighed in real time, thus obtaining the number of drops. Through the coordinated arrangement of these structures, directional collection and real-time quantitative detection of the leaking oil can be achieved, thereby improving the response speed and data accuracy of leakage detection. Ultimately, this solves the problems of poor timeliness and low detection accuracy in testing devices, enabling efficient and accurate detection of leakage in aviation seal life tests.

[0060] Furthermore, the testing device also includes a temperature control component 70. The temperature control component 70 is used to regulate and maintain the temperature within the testing chamber 10 at a preset test temperature. It should be understood that the temperature control component 70 can precisely regulate and stably maintain the temperature within the testing chamber 10, preventing external temperature changes from interfering with the sealing performance of the sealing ring 90 and the physical properties of the oil. This allows the working environment within the sealed chamber to simulate the actual working environment of the aviation sealing ring 90, adapting to the sealing life test requirements under high-temperature conditions, thereby ensuring the consistency between the test conditions and actual operating conditions and improving the accuracy of the test results.

[0061] Furthermore, the inner diameter of the oil guide tube 40 is larger than a preset diameter but less than twice the preset diameter. The preset diameter is the diameter of a single drop of oil at the test temperature. By ensuring that the inner diameter of the oil guide tube 40 is larger than the preset diameter but less than twice the preset diameter, the flow pattern of the oil within the oil guide tube 40 can be effectively restricted, ensuring that the oil falls steadily as droplets.

[0062] When the intervals between oil drips from the leak 23 are short, this ensures that the oil drips into the oil collection cup 50 in two consecutive drops. Simultaneously, the pipe diameter allows the oil to adhere appropriately to the pipe wall, thus prolonging the buffering process of the oil's descent. The oil guide pipe 40 provides a surface for the oil droplets to adhere to; the resistance to the droplets falling against the pipe wall increases, slowing the dripping speed. This ensures that two adjacent drops of oil dripping from the bottom of the oil guide pipe 40 form a clear sequence, preventing the detection balance 60 from misidentifying two drops as one.

[0063] Furthermore, the testing balance 60 is located outside the testing chamber 10, which avoids the high-temperature environment inside the testing chamber 10 from affecting the accuracy of the testing balance 60 and ensures the accuracy of the testing data. A sealing through-hole 80 is provided at the bottom of the testing chamber 10. The lower end of the oil guide pipe 40 extends through the sealing through-hole 80 to the outside of the testing chamber 10 and communicates with the oil collection cup 50. The diameter of the sealing through-hole 80 is matched with the diameter of the oil guide pipe 40, making the size of the sealing through-hole 80 relatively small, thereby reducing temperature leakage within the sealed chamber and maintaining the stability of the test temperature inside the testing chamber 10.

[0064] Because a smaller diameter oil guide pipe 40 results in higher structural bending stiffness, the amplitude of pipe wall vibration caused by the reciprocating motion of piston rod 22 is smaller. Even with limited vibration amplitude, it can still disturb the oil inside the pipe, offsetting the greater dripping resistance caused by the surface tension of the oil and the adhesion force of the pipe wall under small pipe diameter, thus accelerating the oil dripping rate. Furthermore, the lower end of the oil guide pipe 40 extends to the outside of the detection chamber 10 and connects to the oil collection cup 50, but is not rigidly connected to the oil collection cup 50, which can prevent the vibration transmitted by the detection chamber 10 and the oil guide pipe 40 from interfering with the weighing data of the detection balance 60.

[0065] Furthermore, the oil guide pipe 40 includes a pipe body 41 and an oil collecting funnel 42. The pipe body 41 and the oil collecting funnel 42 are connected, and the oil collecting funnel 42 is sealed against the oil outlet 23. The oil collecting cup 50 is connected to the lower end of the pipe body 41. The oil collecting funnel 42 is used to collect the oil dripping from the oil outlet 23. It should be understood that the sealed contact between the oil collecting funnel 42 and the oil outlet 23 prevents oil leakage from the connection point and ensures that all oil flowing out of the oil outlet 23 can enter the interior of the oil guide pipe 40. The oil collecting cup 50 is connected to the lower end of the pipe body 41, which can guide all the oil flowing in the pipe body 41 into the oil collecting cup 50 for centralized collection. The oil collecting funnel 42 is specially used to collect the oil dripping from the oil leak 23. Its funnel-shaped structure can expand the oil receiving range and effectively receive the oil whose dripping position is deviated due to factors such as the reciprocating vibration of the piston rod 22, so as to prevent the oil from spilling outside the oil collecting cup 50, improve the integrity of oil collection, and thus ensure the accuracy of the leakage detection results.

[0066] The oil guide pipe 40 can be a split structure consisting of a pipe body 41 and an oil collecting funnel 42, which facilitates the processing, manufacturing, installation, commissioning, and subsequent maintenance and replacement of the oil guide pipe 40.

[0067] Example 2:

[0068] In this embodiment, a method for detecting leakage in an aviation seal life test is provided, which is applied to an aviation seal life test leakage detection device, such as... Figure 3 As shown, the detection method includes steps S10 to S70. The detection method executes steps S10, S20, S30, S40, S50, S60, and S70 sequentially.

[0069] Step S10: Install the sealing ring 90 to be tested onto the inner wall of the fixed sleeve 21 to ensure the fitting accuracy between the sealing ring 90 and the inner wall of the fixed sleeve 21 and the matching accuracy with the subsequent piston rod 22, so as to provide basic conditions for simulating the actual working state of the sealing ring 90.

[0070] Step S20: Install the test fixture 20 into the test chamber 10 and seal the test chamber 10. This can effectively isolate the interference of external airflow, temperature fluctuations and other environmental factors on the test process, maintain the stability of the test environment and ensure the accuracy of subsequent simulated working conditions.

[0071] Step S30: Install the oil guide pipe 40. Seal and abut the oil guide pipe 40 against the oil leak port 23 below the fixing sleeve 21 and complete the overall installation. This forms a continuous sealed flow channel from the oil leak port 23 to the oil collection cup 50, ensuring that all oil leaking from the sealing ring 90 under test can flow directionally to the oil collection cup 50 through the oil guide pipe 40, avoiding oil spillage that could cause detection errors.

[0072] In step S40, the drive assembly 30 is activated to drive the piston rod 22 in linear reciprocating motion, accumulating the test time. It should be understood that activating the drive assembly 30 provides stable power to the piston rod 22, causing it to perform linear reciprocating motion according to the set frequency and stroke, simulating the actual reciprocating sealing conditions of the seal ring 90 under test in aviation equipment; at the same time, accumulating the test time provides a clear time benchmark for subsequent phased testing, ensuring the controllability and standardization of the test process.

[0073] Step S50: When the test duration is less than the first preset duration, detect the change in the number of leaking oil droplets. In the early stage of the test, the wear of the tested sealing ring 90 is relatively light, the leakage is usually small, and the oil droplet interval is relatively long. At this time, detecting the change in the number of oil droplets can accurately capture minute leaks and effectively improve the sensitivity of initial leak detection.

[0074] Step S60: When the test duration exceeds the first preset duration, detect the weight change of the leaking oil droplets. As the test progresses into the later stages, the wear of the tested sealing ring 90 gradually intensifies, the leakage increases, the oil droplet falling frequency accelerates, and multiple oil drops may even merge and fall. Detecting the weight change of the oil droplets at this time allows for a more efficient and accurate calculation of the total leakage, avoiding misjudgments in drop count due to oil merging, and improving the efficiency and accuracy of leak detection in the later stages.

[0075] In step S70, when the drive assembly 30 drives the piston rod 22 to move for a second preset duration, the drive assembly 30 is controlled to stop working. The second preset duration is longer than the first preset duration. Setting the second preset duration as the total duration of the aviation seal life test, and stopping the drive assembly 30 when the piston rod 22 reaches this duration, ensures that the total test duration for all tested seals 90 is consistent, ensuring the comparability of test results for different seals 90. Simultaneously, by combining initial drop count detection with mid-to-late stage weight detection, the advantages of both detection methods are fully utilized, comprehensively covering the leakage change characteristics of seals 90 at different life stages, further improving the overall accuracy of leakage detection in the aviation seal life test.

[0076] Under simulated actual working conditions, the oil leaking from the sealing interface of the test sealing ring 90 will be collected by gravity and flow out to the oil outlet 23 below the fixed sleeve 21. Then, through the guiding effect of the oil guide pipe 40, it will steadily drip into the oil collection cup 50, realizing the directional and complete collection of the leaked oil and avoiding detection errors caused by oil spillage.

[0077] By identifying the weight change of the oil collecting cup 50, the number of oil drops can be counted cumulatively, and dynamic change data of leakage can be obtained in real time, thereby effectively improving the timeliness of leakage detection.

[0078] By accurately weighing all the leaked oil collected in the oil collection cup 50 and combining it with the density parameters of the oil at the test temperature, the total volume of the leaked oil can be calculated. This provides quantitative data on the total leakage of the seal ring 90 under test within the preset test time, providing an accurate and reliable basis for the life performance evaluation of the aviation seal ring 90.

[0079] Further, step S50 includes steps S51 and S52.

[0080] Step S51: Determine the weight of a single drop of oil based on the size of the leak and the type of oil, and set the weight of the single drop of oil as a preset weight.

[0081] It should be understood that the size of the leak opening affects the range of surface tension when oil drips. Different types of oil have different densities and surface tension characteristics, both of which jointly determine the actual weight of a single drop of oil. By combining these two key parameters to determine the weight of a single drop of oil and using it as a preset weight, the judgment criteria can be highly matched with the actual operating conditions of this test, providing an accurate quantitative basis for subsequent effective leak determination.

[0082] Step S52: When oil drips into the oil collection cup 50, the balance 60 weighs the oil collection cup 50 in real time. When the detected single weight increment is greater than 50% of the preset weight, it is determined as a valid leak and the number of oil drips is accumulated.

[0083] It should be understood that by setting a preset weight threshold of 50%, the minute measurement noise of the balance 60 itself, the minute weight change caused by the dripping of a small amount of oil adhering to the wall of the oil guide pipe 40, and the interference signals caused by external vibration can be effectively filtered out. This ensures that only the weight increment caused by the complete dripping of oil will be judged as a valid leak and accumulated, thereby avoiding missed or false judgments and further improving the accuracy of the leak detection results.

[0084] Furthermore, the diameter of a single oil droplet is determined based on the size of the leak and the type of oil, thus obtaining the diameter of the oil guide tube 40. By accurately determining the diameter of a single oil droplet by combining the size of the leak and the type of oil, and using this as a basis to obtain a suitable diameter for the oil guide tube 40, a reasonable proportional relationship can be formed between the inner diameter of the oil guide tube 40 and the diameter of the single oil droplet. This ensures that the oil can fall stably as a droplet within the oil guide tube 40, while reducing splashing during oil dripping. This ensures that the detection balance 60 can accurately identify the weight change corresponding to each oil droplet, thereby improving the accuracy and reliability of the leak detection results.

[0085] Further, step S30 includes steps S31, S32, and S33.

[0086] Step S31: Determine the diameter of a single drop of oil based on the size of the oil leak 23 and the type of oil.

[0087] The size of the oil leak 23 directly affects the surface tension range when the oil leaves the oil leak 23. Different types of oil have different densities and surface tension coefficients. These two core parameters together determine the actual diameter of a single drop of oil under the test conditions. By combining these two parameters for precise calculation, we can obtain single drop diameter data that perfectly matches the test conditions, providing an accurate quantitative basis for determining the inner diameter of the oil guide tube 40.

[0088] Step S32: Determine the inner diameter of the oil guide tube 40 based on the diameter of a single drop of oil; wherein the inner diameter of the oil guide tube 40 is greater than a preset diameter but less than twice the preset diameter, and the preset diameter is the diameter of a single drop of oil at the test temperature.

[0089] Limiting the inner diameter of the oil guide tube 40 to the above-mentioned range can effectively restrict the flow pattern of the oil in the oil guide tube 40, ensuring that the oil falls steadily as drops; ensuring that the oil can drip into the oil collection cup 50 in sequence, providing a reliable basis for subsequent drop counting and weight detection.

[0090] Step S33: Select the oil guide pipe 40 according to the determined inner diameter of the oil guide pipe 40, and install the oil guide pipe 40.

[0091] Selecting and installing a suitable oil guide pipe 40 based on the calculated inner diameter parameters ensures that the flow guiding performance of the oil guide pipe 40 matches the leakage characteristics of this test, ensuring that the leaked oil can be collected and detected smoothly and accurately, thereby improving the stability of the entire test process and the accuracy of the test results.

[0092] Further, step S33 includes steps S331, S332, S333, and S334.

[0093] Step S331: Select the oil guide pipe 40 according to the determined inner diameter of the oil guide pipe 40.

[0094] Step S332: Lubricate the inner circumferential wall of the oil guide tube 40.

[0095] Step S333: Swing the oil guide tube 40 until the number of oil drops within a preset time period is 0, thus forming an oil film and completing lubrication. Swinging the lubricated oil guide tube 40 causes excess oil on its inner circumferential wall to drip off until no oil drips within the preset time period, forming a uniform and stable oil film on the inner circumferential wall of the oil guide tube 40. By completing the oil film formation process in advance, the gradual accumulation of oil on the inner wall of the oil guide tube 40 during the test can be avoided, which would affect the timing and weight of oil dripping, ensuring the accuracy of the test data.

[0096] Step S334: When the oil guide tube 40 has completed lubrication, install the oil guide tube 40.

[0097] It should be understood that this allows excess oil on the inner wall of the oil guide tube 40 to drip off until no oil drips within a preset time period, thus forming a uniform and stable oil film on the inner wall of the oil guide tube 40. By completing the oil film formation process before the formal start of the test, it is possible to avoid the oil gradually adhering to and accumulating on the inner wall of the oil guide tube 40 during the test, thus preventing the formation of an unstable oil film. This eliminates the interference of the oil film formation process on the amount and timing of oil dripping, thereby preventing the oil film from affecting the results of subsequent tests.

[0098] Further, step S334 includes steps S3341 and S3342.

[0099] Step S3341: After the oil guide tube 40 is lubricated, it is weighed to obtain the first weight. Weighing the oil guide tube 40 after it has been lubricated and a stable oil film has been formed can accurately record the sum of the weight of the oil guide tube 40 itself and the weight of the initial stable oil film, which serves as the benchmark value for subsequent calculation of residual oil volume, eliminating the interference of unstable oil adhesion during the early oil film formation process on the test results.

[0100] Step S3342: Install the weighed oil guide pipe 40. Installing the oil guide pipe 40 after initial weighing prevents oil loss during installation, ensuring the initial reference weight accurately reflects the initial state of the oil guide pipe 40 during testing.

[0101] The detection method also includes steps S80 and S90. The detection method executes steps S10, S20, S30, S40, S50, S60, S70, S80, and S90 in sequence.

[0102] In step S80, when the test duration reaches the third preset duration, the oil guide pipe 40 and the leaked oil are weighed to obtain a second weight; wherein, the second weight is the sum of the weight of the oil guide pipe 40 and the oil; the third preset duration is greater than or equal to the second preset duration. Setting the third preset duration to be greater than or equal to the second preset duration ensures that the weighing operation is performed only after the drive component 30 has stopped working and the test is completely completed, avoiding inaccurate weighing results due to continuous oil dripping during the test; the second weight includes the weight of the oil guide pipe 40 itself, the weight of the initial stable oil film, and the weight of all leaked oil adhering to the inner wall of the oil guide pipe 40 during the test, providing a complete data basis for calculating the amount of residual oil.

[0103] Step S90: Determine the total weight of the leaked oil based on the difference between the second weight and the first weight. By calculating the difference between the second weight and the first weight, the total weight of the leaked oil remaining on the inner wall of the oil guide pipe 40 during the test can be accurately obtained. Adding this weight to the weight of the oil collected in the oil collecting cup 50, the total leakage of the sealing ring 90 under test during the entire test can be obtained, avoiding missed leaks due to some oil not dripping into the oil collecting cup 50, and further improving the accuracy and reliability of the test results.

[0104] For example, a single oil droplet weighs approximately 0.05g. According to aerospace engineering requirements, the number of leaking drops needs to be detected in the early stages of the lifespan. In the later stages, or for linear reciprocating seals where leakage requirements are less stringent, the oil volume and weight can be monitored. The test balance 60 requires a 0.001g electronic balance. During the initial stage of the lifespan test, the weight change of the test balance 60 is monitored through a measurement and control system. A valid number of changes requires a weight change greater than 50% of the oil droplet weight. In the later stages of the lifespan, the change curve of the test balance 60 can be directly obtained through the measurement and control system.

[0105] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A device for detecting leakage during aviation seal life testing, characterized in that, include: The testing chamber is a sealed chamber; A testing fixture, located inside the testing chamber; The test fixture includes a fixed sleeve and a piston rod; The piston rod is slidably assembled inside the fixed sleeve; the sealing ring is fixedly disposed on the inner wall of the fixed sleeve, and the piston rod and the sealing ring are slidably engaged; the fixed sleeve has an oil leakage port; the oil leakage port is located at the bottom of the fixed sleeve; A drive assembly is connected to the piston rod; the drive assembly is used to drive the piston rod to perform linear reciprocating motion. An oil guide pipe, the upper end of which is fitted under the oil leak port; An oil collecting cup, with the lower end of the oil guide pipe passing through the inside of the oil collecting cup; The oil collection cup is placed on the weighing platform of the test balance. The test fixture, the oil guide pipe, the oil collection cup, and the test balance are arranged vertically from top to bottom.

2. The device for detecting leakage during aviation seal life testing according to claim 1, characterized in that, The testing device also includes a temperature control component; the temperature control component is used to regulate and maintain the temperature inside the testing chamber at a preset test temperature.

3. The device for detecting leakage in an aviation seal life test according to claim 2, characterized in that, The inner diameter of the oil guide tube is greater than a preset diameter but less than twice the preset diameter; wherein, the preset diameter is the diameter of a single drop of oil at the test temperature.

4. The device for detecting leakage during aviation seal life testing according to claim 3, characterized in that, The testing balance is located outside the testing chamber; the bottom of the testing chamber is provided with a sealing through hole, and the lower end of the oil guide pipe extends through the sealing through hole to the outside of the testing chamber and connects to the oil collection cup; the diameter of the sealing through hole is adapted to the diameter of the oil guide pipe.

5. The device for detecting leakage in an aviation seal life test according to claim 1, characterized in that, The oil guide pipe includes a pipe body and an oil collecting funnel; the pipe body and the oil collecting funnel are connected; the oil collecting funnel is sealed and abuts against the oil leak; the oil collecting cup is connected to the lower end of the pipe body; the oil collecting funnel is used to collect the oil dripping from the oil leak.

6. A method for detecting leakage during an aviation seal life test, applied to the aviation seal life test leakage detection device according to any one of claims 1-5, characterized in that, The detection method includes: Install the sealing ring to be tested onto the inner wall of the fixing sleeve; Install the testing fixture into the testing chamber and seal the testing chamber; Install oil guide pipe; The start-up drive assembly drives the piston rod to perform linear reciprocating motion, accumulating the test duration; When the test duration is less than the first preset duration, the change in the number of leaked oil droplets is detected; When the test duration exceeds the first preset duration, the weight change of the leaked oil droplets is detected; When the drive assembly drives the piston rod to move for a second preset duration, the drive assembly is controlled to stop working; wherein the second preset duration is longer than the first preset duration.

7. The method for detecting leakage in an aviation seal life test according to claim 6, characterized in that, When the test duration is less than a first preset duration, the change in the number of leaked oil droplets is detected, including: The weight of a single drop of oil is determined based on the size of the leak and the type of oil, and the weight of the single drop of oil is set as a preset weight. When oil drips into the oil collection cup, the weight of the oil collection cup is measured in real time by a detection balance. When the detected single weight increase is greater than 50% of the preset weight, it is determined as a valid leak and the number of oil drips is accumulated.

8. The method for detecting leakage in an aviation seal life test according to claim 6, characterized in that, The installation of the oil guide pipe includes: The diameter of a single drop of oil is determined based on the size of the leak and the type of oil. The inner diameter of the oil guide tube is determined based on the diameter of the single drop of oil; wherein the inner diameter of the oil guide tube is greater than a preset diameter but less than twice the preset diameter, and the preset diameter is the diameter of the single drop of oil at the test temperature; Select the oil guide pipe according to the determined inner diameter of the oil guide pipe, and install the oil guide pipe.

9. The method for detecting leakage in an aviation seal life test according to claim 8, characterized in that, The step of selecting the oil guide pipe according to the determined inner diameter of the oil guide pipe and installing the oil guide pipe includes: Select the oil guide pipe according to the determined inner diameter of the oil guide pipe; The inner circumferential wall of the oil guide tube is lubricated; The oil guide tube is swung until the number of oil droplets falling within a preset time period is 0, so as to form an oil film and complete the lubrication. Once the oil guide tube has been lubricated, install the oil guide tube.

10. The method for detecting leakage in an aviation seal life test according to claim 9, characterized in that, Once the oil guide tube has completed lubrication, the installation of the oil guide tube includes: Once the oil guide tube has been lubricated, it is weighed to obtain a first weight. Install the weighed oil guide pipe; The detection method further includes: When the test duration reaches the third preset duration, the oil guide pipe and the leaked oil are weighed to obtain a second weight; wherein, the second weight is the sum of the weights of the oil guide pipe and the oil; the third preset duration is greater than or equal to the second preset duration; The total weight of the oil leak is determined based on the difference between the second weight and the first weight.

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