Method and device for evaluating service life of skeleton seal, electronic equipment and storage medium

Abstract

The present disclosure provides a method and device for evaluating the service life of a skeleton seal, electronic equipment and a storage medium. The method for evaluating the service life of the skeleton seal comprises: obtaining a test value of an accelerated stress and a test value of a companion test stress of an accelerated life test of the skeleton seal, the accelerated stress comprising: a rotating speed of a rotating shaft on which the skeleton seal acts and an environmental temperature in which the skeleton seal is located, the companion test stress comprising: an installation eccentricity of the skeleton seal relative to the rotating shaft and a temperature of a lubricant sealed by the skeleton seal; determining a total duration that a test bench needs to be in an accelerated test working condition in the accelerated life test based on a comprehensive acceleration factor of the accelerated life test; controlling the test bench to perform the accelerated life test on the skeleton seal; and in a case where a leakage cumulative amount of the skeleton seal leaking the lubricant does not reach a preset leakage amount at the end of the accelerated life test, determining that an actual service life of the skeleton seal can reach a service life target value.

Description

Technical Field

[0001] This disclosure generally relates to the field of skeleton sealing technology, and more specifically, to a method, apparatus, electronic device, and storage medium for assessing the lifespan of skeleton seals. Background Technology

[0002] A skeleton seal structure is a type of sealing structure commonly used in mechanical equipment. It can effectively prevent lubricant leakage and the intrusion of external impurities. It is generally composed of a metal skeleton and an elastic material, and achieves the sealing effect through compression and friction.

[0003] Skeleton seals play a crucial role in the stable operation of mechanical equipment. Their failure can lead to anything from equipment downtime and production stoppages to serious safety issues for maintenance personnel. Therefore, conducting life tests on skeleton seals in advance to assess their service life is essential. However, verifying the 5-year service life of skeleton seals requires a traditional 5-year testing period, which is time-consuming and costly. Summary of the Invention

[0004] Exemplary embodiments of this disclosure provide a method, apparatus, electronic device, and storage medium for assessing the lifespan of a skeleton seal, in order to solve at least one of the problems in the aforementioned related technologies.

[0005] According to a first aspect of the present disclosure, a method for assessing the lifespan of a skeleton seal is provided, comprising: obtaining test values ​​of accelerated stress and test values ​​of auxiliary stress for an accelerated life test of the skeleton seal, wherein the accelerated stress includes: the rotational speed of the rotating shaft on which the skeleton seal acts and the ambient temperature where the skeleton seal is located, and the auxiliary stress includes: the installation eccentricity of the skeleton seal relative to the rotating shaft and the temperature of the lubricant sealed by the skeleton seal; determining a comprehensive acceleration factor for the accelerated life test based on the test values ​​and actual values ​​of the rotational speed and the test values ​​and actual values ​​of the ambient temperature; calculating the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test based on the comprehensive acceleration factor and the target lifespan value of the skeleton seal; controlling the test bench to perform the accelerated life test on the skeleton seal according to the test values ​​of the accelerated stress, the test values ​​of the auxiliary stress, and the total duration for which the test bench needs to be in accelerated test conditions; and determining that the actual lifespan of the skeleton seal can reach the target lifespan value if the cumulative leakage amount of the leaked lubricant in the skeleton seal does not reach a preset leakage amount at the end of the accelerated life test.

[0006] Optionally, the step of determining the comprehensive acceleration factor of the accelerated life test based on the test and actual values ​​of the rotational speed and the test and actual values ​​of the ambient temperature includes: determining the acceleration factor corresponding to the ambient temperature based on the test and actual values ​​of the ambient temperature, the activation energy of the skeleton seal, and the Boltzmann constant; determining the acceleration factor corresponding to the rotational speed based on the test and actual values ​​of the rotational speed and a preset rotational speed acceleration coefficient; and determining the comprehensive acceleration factor based on the acceleration factor corresponding to the rotational speed and the acceleration factor corresponding to the ambient temperature.

[0007] Optionally, the step of calculating the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test, based on the comprehensive acceleration factor and the target service life value of the skeleton seal, includes: determining the target service life value of the skeleton seal based on the design service life of the machine in which the skeleton seal is used and the proportion of the working time of the rotating shaft acted by the skeleton seal during the actual use of the machine; calculating the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test based on the target service life value, the confidence level of the accelerated life test, the comprehensive acceleration factor, the test value and the actual value of the rotational speed; wherein, under the accelerated test conditions, the rotational speed of the rotating shaft acted by the skeleton seal installed on the test bench is continuously at the test value.

[0008] Optionally, the step of calculating the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test, based on the target service life value, the confidence level of the accelerated life test, the comprehensive acceleration factor, the test value and the actual value of the rotational speed, includes: determining the service life verification value of the skeleton seal based on the target service life value and the confidence level of the accelerated life test; determining the total number of rotations required for the rotating shaft acting on the skeleton seal to reach the service life verification value according to the actual value of the rotational speed; determining the total number of test rotations required for the rotating shaft acting on the skeleton seal to rotate during the accelerated life test based on the total number of rotations and the comprehensive acceleration factor; and determining the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test based on the total number of test rotations and the test value of the rotational speed.

[0009] Optionally, the step of controlling the test bench to conduct the accelerated life test on the skeleton seal according to the test value of the accelerated stress, the test value of the accompanying stress, and the total time required to be in the accelerated test condition includes: determining the number of cycles H of a single test process required to complete the accelerated life test based on the total time the test bench needs to be in the accelerated test condition and the time in the accelerated test condition during a single test; controlling the test bench to cyclically conduct the single test process on the skeleton seal until the number of cycles reaches H; wherein, the single test process includes, in sequence: preparation condition before accelerated test, accelerated test condition, and shutdown inspection condition.

[0010] Optionally, the step of controlling the test bench to perform a single test on the skeleton seal repeatedly until the number of cycles reaches H includes: in response to entering the current single test process, controlling the test bench to enter the accelerated test preparation state, wherein, in the accelerated test preparation state, the test bench adjusts the installation eccentricity to the test value, controls the ambient temperature to decrease to a preset temperature value and then maintains it at the preset temperature value, controls the temperature of the lubricant to increase to the test value and then maintains it at the test value, and controls the rotation speed to gradually increase to the rated rotation speed value; in response to the accelerated test preparation state having reached a first preset time, controlling the test bench to enter the accelerated test state, wherein, the test bench accelerates... Under test conditions, the ambient temperature is controlled to rise to the test value and remain at the test value; the temperature of the lubricant is stopped; and the rotational speed is controlled to rise to the test value and remain at the test value. In response to the acceleration test condition having reached a second preset duration, the test bench is controlled to enter a shutdown detection condition. Under the shutdown detection condition, the test bench is controlled to stop, and when the shutdown duration reaches a third preset duration, it is determined whether the current cumulative leakage amount has reached the preset leakage amount and whether the number of cycles has reached H. If the current cumulative leakage amount has not reached the preset leakage amount and the number of cycles has not reached H, then the next single test process begins; otherwise, the accelerated life test ends.

[0011] According to a second aspect of the present disclosure, a life assessment apparatus for a skeleton seal is provided, comprising: a test value acquisition unit configured to acquire test values ​​of accelerated stress and test values ​​of co-test stress for an accelerated life test of the skeleton seal, wherein the accelerated stress includes: the rotational speed of the rotating shaft on which the skeleton seal acts and the ambient temperature of the skeleton seal, and the co-test stress includes: the installation eccentricity of the skeleton seal relative to the rotating shaft and the temperature of the lubricant sealed by the skeleton seal; and an acceleration factor determination unit configured to determine a comprehensive acceleration factor of the accelerated life test based on the test value and actual value of the rotational speed and the test value and actual value of the ambient temperature. The system includes: a factor; an acceleration duration determination unit, configured to calculate the total duration for which the test bench must be in accelerated test conditions during the accelerated life test based on the comprehensive acceleration factor and the target service life value of the skeleton seal; a test control unit, configured to control the test bench to perform the accelerated life test on the skeleton seal according to the test value of the accelerated stress, the test value of the accompanying stress, and the total duration for which it must be in accelerated test conditions; and a life assessment unit, configured to determine that the actual service life of the skeleton seal can reach the target service life value if the cumulative leakage of the lubricant in the skeleton seal does not reach the preset leakage amount at the end of the accelerated life test.

[0012] According to a third aspect of the present disclosure, a computer-readable storage medium storing a computer program is provided, which, when executed by a processor, causes the processor to perform the life assessment method for skeleton seals as described above.

[0013] According to a fourth aspect of the present disclosure, an electronic device is provided, the electronic device comprising: a processor; and a memory storing a computer program that, when executed by the processor, causes the processor to perform the life assessment method for the skeleton seal as described above.

[0014] According to a fifth aspect of the present disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements the life assessment method for skeleton seals as described above.

[0015] The life assessment method, apparatus, electronic device, and storage medium for skeleton seals according to exemplary embodiments of the present disclosure assess the lifespan of skeleton seals by conducting short-term accelerated life tests. On the one hand, this allows for life verification of skeleton seals to be completed in a shorter period, reducing the cost of life verification. On the other hand, it provides effective support for the regular maintenance and replacement of skeleton seals.

[0016] In the following description, some aspects and / or advantages of the general concept of this disclosure will be set forth, and other aspects and / or advantages will become apparent from the following description or from practice of the general concept of this disclosure. Attached Figure Description

[0017] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 A flowchart illustrating a life assessment method for a skeleton seal according to an exemplary embodiment of the present disclosure is provided.

[0019] Figure 2 A flowchart illustrating a method for determining a comprehensive acceleration factor for accelerated life testing according to exemplary embodiments of the present disclosure;

[0020] Figure 3 A flowchart is shown illustrating a method for calculating the total duration for which the test bench must be in accelerated test conditions during accelerated life testing, based on a comprehensive acceleration factor and a target life value for the skeleton seal, according to an exemplary embodiment of the present disclosure.

[0021] Figure 4 A flowchart illustrating a specific method for calculating the total duration for which the test bench needs to be in accelerated test conditions during accelerated life testing, according to an exemplary embodiment of the present disclosure;

[0022] Figure 5 A flowchart illustrating a method for performing a single test on a skeleton seal using a control test bench according to an exemplary embodiment of the present disclosure until the number of cycles reaches H;

[0023] Figure 6 A flowchart illustrating an accelerated life test of a skeleton seal according to an exemplary embodiment of the present disclosure is shown;

[0024] Figure 7 An example of a cross-sectional view of a single test cycle (i.e., a single test procedure) according to an exemplary embodiment of the present disclosure is shown;

[0025] Figure 8 A structural block diagram of a life assessment apparatus for skeleton seals according to an exemplary embodiment of the present disclosure is shown. Detailed Implementation

[0026] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, examples of which are illustrated in the drawings, wherein the same reference numerals always refer to the same parts. The embodiments will now be described with reference to the accompanying drawings in order to explain this disclosure.

[0027] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0028] It should be noted that the phrase "at least one of several items" in this disclosure refers to three parallel cases: "any one of the several items", "a combination of any number of the several items", and "all of the several items". For example, "including at least one of A and B" includes the following three parallel cases: (1) including A; (2) including B; (3) including A and B. As another example, "performing at least one of step one and step two" indicates the following three parallel cases: (1) performing step one; (2) performing step two; (3) performing both step one and step two.

[0029] Figure 1 A flowchart illustrating a life assessment method for a skeleton seal according to an exemplary embodiment of the present disclosure is shown.

[0030] As an example, the life assessment method for skeleton seals according to exemplary embodiments of this disclosure can be performed by an electronic device with data processing capabilities, such as a terminal (e.g., a personal laptop, desktop computer, etc.), a server (e.g., a standalone server, server cluster, cloud platform, etc.), or a controller of a test bench for accelerating life testing of skeleton seals. This disclosure does not limit the scope of the method.

[0031] Reference Figure 1 and Figure 6 In step S101, the test values ​​of accelerated stress and test stress for accelerated life test of skeleton seal are obtained.

[0032] Accelerating stresses include: the rotational speed of the rotating shaft acted upon by the skeleton seal and the ambient temperature of the skeleton seal.

[0033] The test stresses include: the installation eccentricity of the skeleton seal relative to the rotating shaft and the temperature of the lubricant sealed by the skeleton seal (hereinafter referred to as lubricant temperature). As an example, the lubricant may be lubricating oil or lubricating fluid, and this disclosure does not limit its specific type.

[0034] The key to selecting the test stress type is to determine the accelerated stress and the auxiliary stress of the skeleton seal. Based on the failure mode of the skeleton seal in previous performance tests, which is usually wear failure, this disclosure selects the rotational speed and ambient temperature as the accelerated stress, and the installation eccentricity and lubricant temperature as the auxiliary stress.

[0035] Regarding the determination of the force level in the test

[0036] As an exemplary embodiment, the test value T1 of the ambient temperature can be determined based on the upper limit of the design ambient temperature of the skeleton seal and the planned test cycle of the accelerated life test. The test value S1 of the rotational speed can be determined based on the upper limit of the design rotational speed of the skeleton seal and the planned test cycle of the accelerated life test.

[0037] As an exemplary embodiment, the test value of the installation eccentricity can be determined using a random variable method. First, the range of eccentricity [-α, α] present during actual use of the skeleton seal is determined. Then, the eccentricity β is randomly selected from this range as the test value of the installation eccentricity. The test value of the lubricant temperature can be determined based on the lubricant temperature values ​​under different operating conditions during actual use of the skeleton seal.

[0038] In step S102, the comprehensive acceleration factor for the accelerated life test is determined based on the test value S1 and the actual value S0 of the rotational speed, and the test value T1 and the actual value T0 of the ambient temperature.

[0039] The actual rotational speed S0 is the rotational speed of the rotating shaft actually acted upon by the skeleton seal during actual use. The test rotational speed S1 is the rotational speed of the rotating shaft acted upon by the skeleton seal mounted on the test bench (i.e., the rotating shaft on the test bench, used to simulate the rotating shaft acted upon by the skeleton seal during actual use) during accelerated life testing. The test value S1 is accelerated compared to the actual value S0, that is, it is greater than the actual value S0.

[0040] The actual ambient temperature T0 is the actual ambient temperature of the skeleton seal during actual use. The test ambient temperature T1 is the ambient temperature provided to the skeleton seal mounted on the test bench during accelerated life testing. The test value T1 is accelerated compared to the actual value T0, i.e., it is greater than the actual value T0.

[0041] Accelerated factor: refers to the ratio of a certain life characteristic value of a product under accelerated stress to that under normal stress. It can also be called the acceleration coefficient and is a dimensionless number.

[0042] The following will combine Figure 2 An exemplary embodiment of step S102 will be described in detail below, but will not be elaborated here.

[0043] In step S103, based on the comprehensive acceleration factor and the target service life value of the skeleton seal, the total duration t that the test bench needs to be in accelerated test conditions during the accelerated life test is calculated. s .

[0044] Under accelerated testing conditions, the rotational speed of the rotating shaft acted upon by the skeleton seal installed on the test bench remains at the test value.

[0045] The following will combine Figure 3 An exemplary embodiment of step S103 will be described in detail below, but will not be elaborated here.

[0046] In step S104, the control test bench conducts an accelerated life test on the skeleton seal according to the test value of accelerated stress, the test value of the accompanying stress, and the total time required to be in the accelerated test condition.

[0047] As an exemplary embodiment, step S104 may include: determining the number of cycles H of a single test process required to complete the accelerated life test based on the total duration of the test bench in accelerated test condition and the duration of the test bench in accelerated test condition during a single test; and controlling the test bench to perform a single test process on the skeleton seal repeatedly until the number of cycles reaches H.

[0048] A single test process includes, in sequence: accelerated test preparation, accelerated test, and shutdown inspection. The accelerated test preparation is used to prepare for transitioning from the test bench's shutdown state to the accelerated test state. As an example, the duration of the accelerated test preparation and shutdown inspection phases within a single test can be determined based on the duration of the accelerated test phase.

[0049] As an example, based on the ratio of the total time the test bench needs to be in accelerated test conditions to the time spent in accelerated test conditions during a single test, the accelerated life test is divided into multiple test cycles (i.e., multiple single test processes). Test time less than one test cycle is treated as one test cycle. The profile of a single test cycle is as follows: Figure 7 As shown, this is only an example. 0-22h corresponds to the preparation condition before the accelerated test, 22h-103.2h corresponds to the accelerated test condition, and 103.2h to the end corresponds to the shutdown and testing condition.

[0050] The following will combine Figure 5 A detailed exemplary embodiment of the process of controlling the test bench to perform a single test on the skeleton seal until the number of cycles reaches H will be described in detail here, but will not be elaborated on here.

[0051] In step S105, if the cumulative leakage of lubricant from the skeleton seal does not reach the preset leakage amount at the end of the accelerated life test, it is determined that the actual service life of the skeleton seal can reach the service life target value. Otherwise, it is determined that the actual service life of the skeleton seal cannot reach the service life target value.

[0052] Figure 2 A flowchart illustrating a method for determining a comprehensive acceleration factor for accelerated life testing according to an exemplary embodiment of the present disclosure is shown.

[0053] Reference Figure 2 In step S201, the acceleration factor corresponding to the ambient temperature is determined based on the experimental and actual values ​​of the ambient temperature, the activation energy of the skeleton seal, and the Boltzmann constant.

[0054] In step S202, the acceleration factor corresponding to the rotational speed is determined based on the experimental and actual values ​​of the rotational speed and the preset rotational speed acceleration coefficient.

[0055] As an example, the acceleration model corresponding to each acceleration stress is selected. For temperature stress, the Arrhenius model can be selected, and for rotational stress, the inverse power law model can be selected. Accordingly, the acceleration factor AF1 corresponding to temperature stress can be calculated according to equation (1), and the acceleration factor AF2 corresponding to rotational stress can be calculated according to equation (2).

[0056]

[0057] Where E represents the activation energy corresponding to the skeleton seal, for example, the value can be in the range of 0.4 eV to 1.2 eV; k represents the Boltzmann constant, with a value of 8.617 × 10⁻⁶. -5 ev / K; m represents the preset speed acceleration coefficient, for example, the value range can be 1 to 5.

[0058] Acceleration Model: Used to describe the relationship between reliability characteristics of failure modes (mean lifetime, characteristic lifetime, failure rate) and acceleration stress level.

[0059] Activation energy refers to the energy required for a molecule to transition from its normal state to an active state where it is more likely to undergo a chemical reaction. It is related to the properties of the material itself.

[0060] In step S203, a comprehensive acceleration factor is determined based on the acceleration factor corresponding to the rotational speed and the acceleration factor corresponding to the ambient temperature.

[0061] This disclosure takes into account the weak correlation between temperature stress and rotational speed stress, and proposes that the comprehensive acceleration factor AF can be calculated by equation (3) or (4):

[0062] AF = AF1 × AF2 (3)

[0063]

[0064] It should be understood that acceleration factors AF1, AF2, and the combined acceleration factor AF can also be calculated in other appropriate ways, and this disclosure does not limit this.

[0065] Figure 3 A flowchart is shown illustrating a method for calculating the total duration for which the test bench must be in accelerated test conditions during accelerated life testing, based on a comprehensive acceleration factor and a target lifespan value for the skeleton seal, according to an exemplary embodiment of the present disclosure.

[0066] Reference Figure 3 In step S301, based on the design service life t0 of the machine in which the skeleton seal is used and the proportion λ of the working time of the rotating shaft acted by the skeleton seal during the actual use of the machine, the target service life value t of the skeleton seal is determined. y .

[0067] As an example, the target service life value t of the skeleton seal can be calculated using formula (5). y :

[0068] t y =λ·t0 (5)

[0069] Taking a gearbox as an example of a machine in which the skeleton seal is used, if its designed service life is 20 years, and the percentage of working time (i.e., usage ratio, for example, not working when the machine is stopped) of the rotating shaft (output shaft of the gearbox) on which the skeleton seal acts during the actual use of the gearbox is 0.9, then the target service life value t of the skeleton seal is... y It is 18 years.

[0070] In step S302, based on the service life target value, the confidence level of the accelerated life test, the comprehensive acceleration factor, the test value and actual value of the rotation speed, the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test is calculated.

[0071] As an exemplary embodiment, refer to Figure 4 Step S302 may include steps S401 to S404.

[0072] In step S401, the service life verification value of the skeleton seal is determined based on the service life target value and the confidence level of the accelerated life test.

[0073] To verify the actual service life of the skeleton seal, the expansion factor θ can be determined by referring to the statistical scheme in the reliability qualification and acceptance test of GJB899A-2009. For example, when the confidence level is 0.8, θ can be taken as 1.2. For example, the service life verification value t can be calculated by equation (6):

[0074] t = θ·t y (6)

[0075] In step S402, it is determined that if the service life verification value is achieved according to the actual value S0 of the rotational speed, the total number of rotations N required for the rotating shaft acted upon by the skeleton seal is determined.

[0076] When designing accelerated life tests for skeleton seals, the service life verification value t needs to be converted into the number of rotations of the skeleton seal. For example, the calculation formula is shown in equation (7):

[0077] N=t·(365×24×60)·S0 (7)

[0078] The unit of S0 is r / min.

[0079] In step S403, based on the total number of revolutions N and the comprehensive acceleration factor AF, the total number of test revolutions n required for the rotating shaft acting on the skeleton seal during the accelerated life test is determined. For example, the calculation formula is shown in equation (8):

[0080]

[0081] In step S404, based on the total number of test cycles n and the test value S1 of the rotational speed, the total duration t that the test bench needs to be in accelerated test conditions during the accelerated life test is determined. s For example, its calculation formula is shown in equation (9):

[0082]

[0083] Where S1 is in units of r / min, t s The unit is h.

[0084] Figure 5 A flowchart illustrating a method for performing a single test on a skeleton seal using a control test bench according to an exemplary embodiment of the present disclosure until the number of cycles reaches H.

[0085] As an example, before entering the first single test process, install the skeleton seal to be tested into the corresponding position on the test bench according to the actual installation method when using the skeleton seal, ensuring that the installation error of the skeleton seal to be tested is within an acceptable range; pump the lubricant to be sealed by the skeleton seal to be tested into the corresponding position on the test bench, and submerge the electric heating element; close the door of the environmental chamber (used to provide ambient temperature for the skeleton seal to be tested) and turn on the power.

[0086] Reference Figure 5 In step S501, in response to entering the current single test process, the test bench is controlled to enter the accelerated test preparation state.

[0087] Before the accelerated test, the test bench adjusts the installation eccentricity to the test value, controls the ambient temperature to drop to the preset temperature value and then maintains it at the preset temperature value, controls the lubricant temperature to rise to the test value and then maintains it at the test value, and controls the rotational speed of the rotating shaft acted upon by the skeleton seal to gradually increase to the rated speed value.

[0088] As an example, such as Figure 7 As shown, the test bench is in the preparation condition before the accelerated test:

[0089] Adjust the installation eccentricity of the skeleton seal to the test value;

[0090] After the temperature of the environmental chamber is reduced to a preset temperature value (e.g., -35±3℃), it is maintained at that temperature value until the accelerated test condition is entered.

[0091] Furthermore, the electric heating element is activated after 2 hours, and the lubricant temperature is heated to -8±3℃ within 30 minutes and maintained at this temperature for a period of time. Then, the lubricant temperature is heated to the test value (e.g., 25±3℃) within 30 minutes and maintained at this temperature value until the accelerated test condition is entered. For example, an interlock protection device can be set for the electric heating element to automatically cut off the heating of the electric heating element when the lubricant temperature exceeds 28℃.

[0092] Furthermore, after 2.5 hours, the motor is started, and the rotating shaft acting on the skeleton seal is run at a low speed for 3 hours. Then, the rotating shaft acting on the skeleton seal is run at the rated speed until the accelerated test condition is entered.

[0093] In step S502, in response to the fact that the preparation period before entering the accelerated test has reached the first preset time, the test bench is controlled to enter the accelerated test condition.

[0094] Under accelerated testing conditions, the test bench controls the ambient temperature to rise to the test value and then maintains it at the test value, stops controlling the temperature of the lubricant, and controls the rotational speed of the rotating shaft acting on the skeleton seal to rise to the test value and then maintain it at the test value.

[0095] As an example, such as Figure 7 As shown, the test bench is under accelerated testing conditions:

[0096] Within 2 hours, the temperature of the environmental chamber is raised to the test value T1 and then maintained at T1 until the shutdown test condition is entered.

[0097] Furthermore, the electric heating element is controlled to stop working, thereby ceasing to control the temperature of the lubricant;

[0098] Furthermore, the motor is controlled to make the rotating shaft acting on the skeleton seal run at the test value S1 until the machine enters the shutdown test condition.

[0099] In step S503, in response to the second preset time having been reached when entering the accelerated test mode, the test bench is controlled to enter the shutdown test mode.

[0100] During the shutdown testing phase, the test bench is controlled to stop. When the shutdown duration reaches the third preset duration (e.g., 4 hours), it is determined whether the current cumulative leakage amount has reached the preset leakage amount and whether the number of cycles has reached H. If the current cumulative leakage amount has not reached the preset leakage amount and the number of cycles has not reached H, the next single test process begins; otherwise, the accelerated life test ends.

[0101] As an example, controlling the shutdown of the test bench may include: stopping the motor from working; stopping the environmental chamber from working.

[0102] According to exemplary embodiments of this disclosure, accelerated life testing of skeleton seals can complete the service life verification of skeleton seals in just a few months, effectively reducing verification costs; and it provides support for planned shutdown and replacement of skeleton seals before the end of their service life, effectively ensuring production efficiency.

[0103] Figure 8 A structural block diagram of a life assessment apparatus for skeleton seals according to an exemplary embodiment of the present disclosure is shown.

[0104] Reference Figure 8 The life assessment apparatus for skeleton seals according to an exemplary embodiment of the present disclosure includes: a test value acquisition unit 100, an acceleration factor determination unit 200, an acceleration duration determination unit 300, a test control unit 400, and a life assessment unit 500.

[0105] Specifically, the test value acquisition unit 100 is configured to acquire the test values ​​of accelerated stress and test values ​​of surcharge stress for accelerated life testing of the skeleton seal.

[0106] Accelerated stresses include: the rotational speed of the rotating shaft to which the skeleton seal acts and the ambient temperature of the skeleton seal; test stresses include: the installation eccentricity of the skeleton seal relative to the rotating shaft and the temperature of the lubricant sealed by the skeleton seal.

[0107] The acceleration factor determination unit 200 is configured to determine the comprehensive acceleration factor for accelerated life testing based on the test and actual values ​​of rotational speed and the test and actual values ​​of ambient temperature.

[0108] The acceleration duration determination unit 300 is configured to calculate the total duration for which the test bench must be in accelerated test conditions during the accelerated life test, based on the comprehensive acceleration factor and the target value of the lifespan of the skeleton seal.

[0109] The test control unit 400 is configured to control the test bench to perform accelerated life tests on the skeleton seal according to the test value of accelerated stress, the test value of the accompanying stress, and the total duration of the accelerated test conditions.

[0110] The life assessment unit 500 is configured to determine that the actual service life of the skeleton seal can reach the service life target value if the cumulative leakage of the lubricant in the skeleton seal does not reach the preset leakage amount at the end of the accelerated life test.

[0111] As an exemplary embodiment, the acceleration factor determination unit 200 may be configured to: determine the acceleration factor corresponding to the ambient temperature based on the experimental and actual values ​​of the ambient temperature, the activation energy of the skeleton seal, and the Boltzmann constant; determine the acceleration factor corresponding to the rotational speed based on the experimental and actual values ​​of the rotational speed and a preset rotational speed acceleration coefficient; and determine a comprehensive acceleration factor based on the acceleration factor corresponding to the rotational speed and the acceleration factor corresponding to the ambient temperature.

[0112] As an exemplary embodiment, the acceleration duration determination unit 300 may be configured to: determine a target lifespan value for the skeleton seal based on the design lifespan of the mechanical machine in which the skeleton seal is used and the proportion of the working time of the rotating shaft acted by the skeleton seal during the actual use of the mechanical machine; calculate the total duration for which the test bench must be in accelerated test conditions during the accelerated life test based on the target lifespan value, the confidence level of the accelerated life test, the comprehensive acceleration factor, the test value and the actual value of the rotational speed; wherein, under the accelerated test conditions, the rotational speed of the rotating shaft acted by the skeleton seal installed on the test bench is continuously at the test value.

[0113] As an exemplary embodiment, the acceleration duration determination unit 300 may be configured to: determine the service life verification value of the skeleton seal based on the service life target value and the confidence level of the accelerated life test; determine the total number of rotations required for the rotating shaft acting on the skeleton seal to reach the service life verification value if the actual rotation speed is used; determine the total number of test rotations required for the rotating shaft acting on the skeleton seal to rotate in the accelerated life test based on the total number of rotations and the comprehensive acceleration factor; and determine the total duration for which the test bench needs to be in accelerated test conditions in the accelerated life test based on the total number of test rotations and the test value of the rotation speed.

[0114] As an exemplary embodiment, the test control unit 400 may be configured to: determine the number of cycles H of a single test process required to complete the accelerated life test based on the total duration of the test bench in the accelerated test condition and the duration of the accelerated test condition during a single test; control the test bench to perform a single test process on the skeleton seal repeatedly until the number of cycles reaches H; wherein, the single test process includes, in sequence: preparation condition before accelerated test, accelerated test condition, and shutdown inspection condition.

[0115] As an exemplary embodiment, the test control unit 400 may be configured to: in response to entering the current single test process, control the test bench to enter the accelerated test preparation state, wherein, in the accelerated test preparation state, the test bench adjusts the installation eccentricity to the test value, controls the ambient temperature to decrease to a preset temperature value and then maintains it at the preset temperature value, controls the lubricant temperature to rise to the test value and then maintains it at the test value, and controls the rotation speed to gradually increase to the rated rotation speed value; in response to the accelerated test preparation state having reached a first preset duration, control the test bench to enter the accelerated test state, wherein, in the accelerated test state, the test bench controls the loop... After the ambient temperature rises to the test value and remains at the test value, the temperature of the lubricant is stopped, and the rotational speed is raised to the test value and remains at the test value. In response to the second preset duration of entering the accelerated test condition, the test bench is controlled to enter the shutdown detection condition. In the shutdown detection condition, the test bench is controlled to stop, and when the shutdown duration reaches the third preset duration, it is determined whether the current cumulative leakage amount has reached the preset leakage amount and whether the number of cycles has reached H. If the current cumulative leakage amount has not reached the preset leakage amount and the number of cycles has not reached H, the next single test process is entered; otherwise, the accelerated life test ends.

[0116] It should be understood that the specific processes performed by the life assessment apparatus for the skeleton seal according to the exemplary embodiments of this disclosure have been referenced. Figures 1 to 7 A detailed description has been provided, and the relevant details will not be repeated here.

[0117] It should be understood that the various units in the skeleton seal life assessment apparatus according to exemplary embodiments of this disclosure may be implemented as hardware components and / or software components. Those skilled in the art can implement the various units, for example, using field-programmable gate arrays (FPGAs) or application-specific integrated circuits (ASICs), based on the processes performed by the defined various units.

[0118] An electronic device according to an exemplary embodiment of the present disclosure includes: at least one processor (not shown) and at least one memory (not shown), wherein the at least one memory stores a computer program that, when executed by the at least one processor, causes the at least one processor to perform a life assessment method for a skeleton seal as described in the exemplary embodiment above.

[0119] As an example, the electronic device may be an electronic device with data processing capabilities. For example, the electronic device may be a terminal (such as a personal laptop, desktop computer, etc.), a server (such as a standalone server, server cluster, cloud platform, etc.), or a controller of a test bench used for accelerated life testing of the skeleton seal. This disclosure does not limit this.

[0120] According to exemplary embodiments of this disclosure, a computer-readable storage medium storing instructions may also be provided, wherein when the instructions are executed by at least one processor, they cause at least one processor to perform the life assessment method for the skeleton seal as described in the exemplary embodiments above. Examples of computer-readable storage media herein include: read-only memory (ROM), random access programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), flash memory, non-volatile memory, CD-ROM, CD-R, CD+R, CD-RW, CD+RW, DVD-ROM, DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM, BD-ROM, BD-R, BD-R LTH, BD-RE, Blu-ray or optical disc storage, hard disk drive (HDD), solid-state drive (SSD), card storage (such as multimedia cards, secure digital (SD) cards, or ultra-fast digital (XD) cards), magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid-state drive, and any other device configured to store a computer program and any associated data, data files, and data structures in a non-transitory manner and to provide the computer program and any associated data, data files, and data structures to a processor or computer so that the processor or computer can execute the computer program. The computer program in the aforementioned computer-readable storage medium can run in an environment deployed in computer devices such as clients, hosts, agent devices, servers, etc. Furthermore, in one example, the computer program and any associated data, data files, and data structures are distributed across a networked computer system, such that the computer program and any associated data, data files, and data structures are stored, accessed, and executed in a distributed manner through one or more processors or computers.

[0121] According to exemplary embodiments of the present disclosure, a computer program product may also be provided, wherein the instructions in the computer program product are executable by at least one processor to perform the life assessment method for skeleton seals as described in the exemplary embodiments above.

[0122] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0123] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for evaluating the lifespan of a skeleton seal, characterized in that, include: The test values ​​of accelerated stress and test stress for accelerated life testing of skeleton seals are obtained. The accelerated stress includes the rotational speed of the rotating shaft on which the skeleton seal acts and the ambient temperature of the skeleton seal. The test stress includes the installation eccentricity of the skeleton seal relative to the rotating shaft and the temperature of the lubricant sealed by the skeleton seal. Based on the experimental and actual values ​​of the rotational speed and the experimental and actual values ​​of the ambient temperature, the comprehensive acceleration factor of the accelerated life test is determined. Based on the comprehensive acceleration factor and the target service life value of the skeleton seal, calculate the total time that the test bench needs to be in accelerated test conditions during the accelerated life test; The test bench is controlled to perform the accelerated life test on the skeleton seal according to the test value of the accelerated stress, the test value of the accompanying stress, and the total time required to be in the accelerated test condition; If the cumulative leakage of the lubricant from the skeleton seal does not reach the preset leakage amount at the end of the accelerated life test, it is determined that the actual service life of the skeleton seal can reach the target service life value.

2. The life assessment method according to claim 1, characterized in that, The step of determining the comprehensive acceleration factor of the accelerated life test based on the test and actual values ​​of the rotational speed and the test and actual values ​​of the ambient temperature includes: Based on the experimental and actual values ​​of the ambient temperature, the activation energy of the skeleton seal, and the Boltzmann constant, the acceleration factor corresponding to the ambient temperature is determined. Based on the experimental and actual values ​​of the rotational speed and the preset rotational speed acceleration coefficient, the acceleration factor corresponding to the rotational speed is determined; The comprehensive acceleration factor is determined based on the acceleration factor corresponding to the rotational speed and the acceleration factor corresponding to the ambient temperature.

3. The life assessment method according to claim 1, characterized in that, The step of calculating the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test, based on the comprehensive acceleration factor and the target service life value of the skeleton seal, includes: Based on the design service life of the mechanical machine in which the skeleton seal is used and the proportion of the working time of the rotating shaft acted by the skeleton seal during the actual use of the mechanical machine, the target value of the service life of the skeleton seal is determined. Based on the target service life value, the confidence level of the accelerated life test, the comprehensive acceleration factor, the test value and actual value of the rotation speed, calculate the total time that the test bench needs to be in accelerated test conditions during the accelerated life test; During the accelerated test, the rotational speed of the rotating shaft acted upon by the skeleton seal mounted on the test bench remains at the test value.

4. The life assessment method according to claim 3, characterized in that, The step of calculating the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test, based on the target service life value, the confidence level of the accelerated life test, the comprehensive acceleration factor, and the test and actual values ​​of the rotational speed, includes: Based on the target service life value and the confidence level of the accelerated life test, the service life verification value of the skeleton seal is determined. Determine the total number of rotations required for the rotating shaft acting on the skeleton seal to reach the service life verification value if the actual value of the rotation speed is used. Based on the total number of revolutions and the comprehensive acceleration factor, determine the total number of test revolutions required for the rotating shaft acting on the skeleton seal during the accelerated life test; Based on the total number of test cycles and the test value of the rotation speed, the total duration for which the test bench needs to be in accelerated test condition during the accelerated life test is determined.

5. The life assessment method according to claim 3, characterized in that, The steps of controlling the test bench to conduct the accelerated life test on the skeleton seal according to the test value of the accelerated stress, the test value of the accompanying stress, and the total time required to be in the accelerated test condition include: Based on the total duration of the test bench in accelerated test conditions during the accelerated life test and the duration of the test bench in accelerated test conditions during a single test, the number of cycles H required to complete the accelerated life test for a single test process is determined. The test bench is controlled to perform a single test on the skeleton seal in a cyclic manner until the number of cycles reaches H; The single test process includes, in sequence: preparation for accelerated testing, accelerated testing, and shutdown testing.

6. The life assessment method according to claim 5, characterized in that, The step of controlling the test bench to perform a single test on the skeleton seal repeatedly until the number of cycles reaches H includes: In response to entering the current single test process, the test bench is controlled to enter the accelerated test preparation mode, wherein, in the accelerated test preparation mode, the installation eccentricity is adjusted to the test value, the ambient temperature is controlled to decrease to the preset temperature value and then remain at the preset temperature value, the temperature of the lubricant is controlled to increase to the test value and then remain at the test value, and the rotation speed is controlled to gradually increase to the rated rotation speed value. In response to the fact that the preparation period before entering the accelerated test has reached the first preset time, the test bench is controlled to enter the accelerated test condition. In the accelerated test condition, the test bench controls the ambient temperature to rise to the test value and then remains at the test value, stops controlling the temperature of the lubricant, and controls the rotation speed to rise to the test value and then remains at the test value. In response to the fact that the accelerated test condition has been entered for a second preset duration, the test bench is controlled to enter a shutdown detection condition. In the shutdown detection condition, the test bench is controlled to shut down, and when the shutdown duration reaches a third preset duration, it is determined whether the current cumulative leakage amount has reached the preset leakage amount and whether the number of cycles has reached H. If the current cumulative leakage amount does not reach the preset leakage amount and the number of cycles does not reach H, then proceed to the next single test process; otherwise, end the accelerated life test.

7. A life assessment device for a skeleton seal, characterized in that, include: The test value acquisition unit is configured to acquire the test value of accelerated stress and the test value of auxiliary stress for accelerated life test of skeleton seal, wherein the accelerated stress includes: the rotational speed of the rotating shaft on which the skeleton seal acts and the ambient temperature of the skeleton seal, and the auxiliary stress includes: the installation eccentricity of the skeleton seal relative to the rotating shaft and the temperature of the lubricant sealed by the skeleton seal. An acceleration factor determination unit is configured to determine a comprehensive acceleration factor for the accelerated life test based on the test and actual values ​​of the rotational speed and the test and actual values ​​of the ambient temperature. The acceleration duration determination unit is configured to calculate the total duration for which the test bench needs to be in accelerated test conditions during the accelerated life test, based on the comprehensive acceleration factor and the target value of the service life of the skeleton seal. The test control unit is configured to control the test bench to perform the accelerated life test on the skeleton seal according to the test value of the accelerated stress, the test value of the accompanying stress, and the total duration of the accelerated test condition. The life assessment unit is configured to determine that the actual service life of the skeleton seal can reach the target service life value if the cumulative leakage of the leaking lubricant in the skeleton seal does not reach the preset leakage amount at the end of the accelerated life test.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it causes the processor to perform the life assessment method for the skeleton seal as described in any one of claims 1 to 6.

9. An electronic device, characterized in that, The electronic device includes: processor; The memory stores a computer program that, when executed by a processor, causes the processor to perform the life assessment method for the skeleton seal as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the life assessment method for the skeleton seal as described in any one of claims 1 to 6.

Images