Durability test method for spherical compensator of air pipeline of aero-engine

Abstract

The invention provides an aero-engine air pipeline spherical compensator durability test method, and belongs to the field of aero-engine component tests.The method comprises the steps that multiple points in the circumferential direction of a spherical compensator are marked, and the spherical compensator is installed on a spherical compensator test device; under different working conditions, the spherical compensator is deflected to the maximum working angle according to a plurality of points evenly distributed in the circumferential direction, and the initial bending moment of the spherical compensator is obtained; the spherical compensator is heated to the working temperature and kept stable, charging and pressure relief operation circulation is carried out, and when the maximum operation circulation number agreed by the technical requirement is reached, the bending moment of the spherical compensator is obtained and compared with the initial bending moment; the maximum operation cycle of the spherical compensator in four directions is carried out, the interval between every two adjacent directions is 90 degrees, the cycle times in each direction are the same, and after the maximum operation cycle times agreed by the technical requirement are reached, the spherical compensator is pressurized to the working pressure and kept for preset time; and checking the spherical compensator.

Description

Technical Field

[0001] This application belongs to the field of aero-engine component tests, and particularly relates to a durability test method for a spherical compensator of an aero-engine air pipeline. Background Technique

[0002] The external pipeline system of an aero-engine includes a starter air intake pipeline and an environmental control pipeline. Both pipelines are large-diameter high-temperature air pipelines, which have strong rigidity, large manufacturing errors, and disadvantages such as poor self-compensation ability. In order to overcome the compensation requirements at the mechanical interface position of the large-diameter pipeline and the thermal deformation incoordination between the pipeline and the casing, a spherical compensator is generally used for pipeline compensation, thereby effectively reducing the thermal stress and assembly stress of the pipeline, and improving the service life, reliability, and assembly processability of the pipeline.

[0003] Both ends of the spherical compensator are pipeline interfaces, and the middle part is connected by a bellows and a ball hinge structure. After overall assembly, it is formed by welding. The spherical compensator is mainly used for angular compensation and has an angular displacement limit function when exceeding the maximum compensation amount. Due to the angular compensation actuation of the spherical compensator and the influence of the bleed air pressure fluctuation, the spherical compensator works frequently, which puts forward requirements for the reliability of the spherical compensator. To evaluate the reliability of the spherical compensator, a durability test needs to be carried out on the spherical compensator. Summary of the Invention

[0004] The purpose of this application is to provide a durability test method for a spherical compensator of an aero-engine air pipeline to solve or mitigate at least one problem in the background technique.

[0005] The technical solution of this application is: A durability test method for a spherical compensator of an aero-engine air pipeline, including:

[0006] Mark multiple points in the circumferential direction of the spherical compensator and install the spherical compensator on a spherical compensator test device;

[0007] Under different working conditions, deflect the spherical compensator to the maximum working angle respectively at multiple points evenly distributed in the circumferential direction to obtain the initial bending moment of the spherical compensator, and the initial bending moment is not greater than the design requirement value;

[0008] On the spherical compensator test device, heat the spherical compensator to the working temperature and keep it stable, and perform charging and pressure relief operation cycles. When the maximum number of operation cycles agreed upon by the technical requirements is reached, measure and calculate the bending moment of the spherical compensator and compare it with the initial bending moment, and the bending moment is not greater than the design requirement value;

[0009] Perform the maximum operating cycles in 4 directions of the spherical compensator, with an interval of 90 degrees between adjacent directions, and the number of cycles in each direction is the same. After reaching the maximum number of operating cycles stipulated in the technical requirements, pressurize the spherical compensator to the working pressure and maintain it for a predetermined time, and leakage is not allowed.

[0010] After the durability cycle test, inspect the spherical compensator to check whether the state of the spherical compensator meets the usage requirements, and the usage requirements include no permanent deformation, offset, damage, and leakage.

[0011] Preferably, before marking multiple points on the circumference of the spherical compensator, it further includes:

[0012] Inspect the state of the spherical compensator to determine that the spherical compensator meets the design requirements and manufacturing standards.

[0013] Preferably, the number of marked points on the circumference of the spherical compensator is 4, 6, or 8, and the marked points are evenly distributed circumferentially.

[0014] Preferably, the different working conditions include room temperature and non-pressurized condition, room temperature and working pressure condition, working temperature and non-pressurized condition, and working temperature and working pressure condition.

[0015] Preferably, the charging and discharging operation cycle is to pressurize the inner cavity to the working pressure, deflect to the maximum working angle, return to the zero position, and relieve the pressure.

[0016] The durability test method for the spherical compensator of the aero-engine air pipeline proposed in this application can not only test the pressure fluctuation of the spherical compensator, but also test the deflection of the spherical compensator. The test cycle times are limited by technical requirements to complete the evaluation of the durability of the spherical compensator. During the test process, the states of the spherical compensator before and after the test are recorded, inspected, and compared, which improves the reliability of the test method. By completing the durability evaluation of the spherical compensator, the usage risk of the spherical compensator is reduced, and the reliability of the external pipeline system of the aero-engine is improved. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions provided in this application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application.

[0018] Figure 1 It is a schematic structural diagram of the spherical compensator for the aero-engine air pipeline.

[0019] Figure 2 It is a flowchart of the durability test of the spherical compensator for the aero-engine air pipeline of this application. Detailed Embodiments

[0020] To make the purpose, technical solution and advantages of the present application more clear, the technical solution in the embodiments of the present application will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present application.

[0021] As Figure 1 shown is a schematic structural diagram of a typical spherical compensator. The two ends of the spherical compensator 10 are pipeline interfaces 11. A corrugated pipe 12 is connected between the two pipeline interfaces 11. A left outer support 13 and a right outer support 14 are provided outside the corrugated pipe 12. The left outer support 13 is welded to the left pipeline interface 11. The right outer support 14 is arranged between an outer spherical hinge 15 and an inner spherical hinge 16 welded to the right pipeline interface 11. The left outer support 13 and the right outer support 14 can slide relative to each other, and the right outer support 14 can rotate relative to the outer spherical hinge 15 and the inner spherical hinge 16.

[0022] In order to conduct a durability test on the spherical compensator 10, the present application provides a durability test method for the spherical compensator of an aero-engine air pipeline.

[0023] As Figure 2 shown, the durability test method for the spherical compensator of an aero-engine air pipeline provided by the present application includes the following steps:

[0024] Step S10, conduct a status check on the spherical compensator 10 to determine that the spherical compensator 10 meets the design requirements and manufacturing standards.

[0025] In the present application, the status check on the spherical compensator 10 usually includes design requirement check, technical specification check, material and processing technology check, etc., so as to determine that the design requirements, structural dimensions, materials, etc. of the spherical compensator 10 meet the relevant standards. For example, in some embodiments, the material of the corrugated pipe 12 is GH4169, and the materials of the remaining structures are GH4169 or 0Cr18Ni9. During the status check, it can be checked whether the above materials meet the relevant standards. It should be noted that the structural materials in the above embodiments can be determined according to the working environment temperature conditions of the air pipeline.

[0026] Step S20, mark multiple points on the circumference of the spherical compensator 10 and install it on the spherical compensator test device.

[0027] The spherical compensator test device is mainly used to detect the pressure resistance and sealing performance, anti-fatigue strength and wear degree of the sealing filler of the spherical compensator. The spherical compensator test device includes a pressure loading system, a heating system, a compensator angle swinging actuator structure and related parameter adjustment and measurement systems. The spherical compensator test device can adopt existing devices or systems, and the spherical compensator test device will not be elaborated here.

[0028] In this application, the number of circumferential marks on the spherical compensator can be 4, 6, 8, etc. The marking points are evenly distributed circumferentially. The more the number of points, the higher the accuracy of the circumferential deflection test of the spherical compensator 10.

[0029] Step S30: Under different working conditions, deflect the spherical compensator to the maximum working angle respectively at multiple points evenly distributed circumferentially to obtain the initial bending moment of the spherical compensator 10, and the initial bending moment should not be greater than the design requirement value.

[0030] After the spherical compensator is installed on the spherical compensator test device, first measure and record the initial bending moment of the spherical compensator according to different working conditions, as shown in Table 1. In this embodiment of the application, the different working conditions include four working conditions: room temperature + no pressure condition, room temperature + working pressure condition, working temperature + no pressure condition, and working temperature + working pressure condition.

[0031] Table 1 Record Table of Measurement Results of Initial Bending Moment of Spherical Compensator

[0032]

[0033] Step S40: On the spherical compensator test device, heat the spherical compensator 10 to the working temperature and keep it stable, perform charging and discharging operation cycles. When the maximum number of operation cycles agreed upon in the technical requirements is reached, measure and calculate the bending moment of the spherical compensator according to the process of Step S30, and compare it with the initial bending moment. The bending moment should not be greater than the design requirement value.

[0034] In this application, after the spherical compensator 10 is heated to the working temperature and stabilized, perform charging and discharging operation cycles according to the pressure cycle process of "pressurize the inner cavity to the working pressure → deflect to the maximum working angle → return to the zero position → relieve pressure". When the number of pressure cycles reaches the number of technical requirements, measure and record the bending moment of the spherical compensator under different working conditions, as shown in Table 2.

[0035] Table 2 Record Table of Measurement Results of Bending Moment after Pressure Test of Spherical Compensator

[0036]

[0037] Step S50: Perform the maximum operation cycles in 4 directions of the spherical compensator, with an interval of 90 degrees between adjacent directions, and the number of cycles in each direction is the same. When the maximum number of operation cycles agreed upon in the technical requirements is reached, pressurize the spherical compensator to the working pressure and keep it for a predetermined time, and leakage is not allowed;

[0038] In this application, a deflection test of the spherical compensator 10 is carried out in a total of 4 directions. According to the pressure cycle process of "pressurizing the inner cavity to the working pressure → deflecting to the maximum working angle → restoring to the zero position → relieving pressure", the charging and pressure-relieving operation cycles are carried out. When the number of pressure cycles reaches the required number of times, the spherical compensator is pressurized to the working pressure and kept under pressure. The pressure-holding time can generally be set to 2 minutes. Then, a leakage inspection is carried out, and an inspection form is filled out, as shown in Table 3.

[0039] Table 3 Inspection Form for Leakage Condition of Spherical Compensator after Deflection Test

[0040]

[0041] In step S60, after the durability cycle test, the spherical compensator 10 is inspected to check whether the state of the spherical compensator 10 meets the usage requirements. The spherical compensator 10 should have no problems such as permanent deformation, offset, damage, and leakage.

[0042] The durability test method of the spherical compensator for the aero-engine air pipeline proposed in this application can not only test the pressure fluctuation of the spherical compensator, but also test the deflection of the spherical compensator. By limiting the number of test cycles through technical requirements, the durability of the spherical compensator is evaluated. During the test process, the states of the spherical compensator before and after the test are recorded, inspected, and compared, which improves the reliability of the test method. By completing the durability evaluation of the spherical compensator, the usage risk of the spherical compensator is reduced, and the reliability of the external pipeline system of the aero-engine is improved.

[0043] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. A durability test method for a spherical compensator of an aero-engine air pipeline, characterized in that Including: Mark a plurality of circumferential points of the spherical compensator, and install the spherical compensator on the spherical compensator test device; Under different working conditions, deflect the spherical compensator to the maximum working angle respectively at a plurality of points evenly distributed circumferentially, and obtain the initial bending moment of the spherical compensator, where the initial bending moment is not greater than the design requirement value; On the spherical compensator test device, heat the spherical compensator to the working temperature and keep it stable, perform a charging and pressure-relieving operation cycle. After reaching the maximum number of operating cycles agreed upon in the technical requirements, measure and calculate the bending moment of the spherical compensator, and compare it with the initial bending moment, where the bending moment is not greater than the design requirement value; Perform the maximum operating cycle in 4 directions of the spherical compensator, with an interval of 90 degrees between adjacent directions, and the number of cycles in each direction is the same. After reaching the maximum number of operating cycles agreed upon in the technical requirements, pressurize the spherical compensator to the working pressure and keep it for a predetermined time, and no leakage is allowed; After the durability cycle test, inspect the spherical compensator to check whether the state of the spherical compensator meets the usage requirements, where the usage requirements include no permanent deformation, offset, damage, and leakage.

2. The durability test method for the spherical compensator of the air pipeline of an aeroengine according to claim 1, characterized in that Before marking a plurality of circumferential points of the spherical compensator, it further includes: Inspect the state of the spherical compensator to determine that the spherical compensator meets the design requirements and manufacturing standards.

3. The durability test method for the spherical compensator of the aero-engine air pipeline according to claim 1 or 2, characterized in that, The number of points marked on the circumference of the spherical compensator is 4 points, 6 points, or 8 points, and the marked points are evenly distributed circumferentially.

4. The durability test method of the spherical compensator for the air pipeline of an aeroengine according to claim 3, characterized in that, The different working conditions include room temperature and non-pressurized condition, room temperature and working pressure condition, working temperature and non-pressurized condition, and working temperature and working pressure condition.

5. The durability test method for the spherical compensator of the aero-engine air pipeline according to claim 4, characterized in that The charging and pressure-relieving operation cycle is to pressurize the inner cavity to the working pressure, deflect to the maximum working angle, return to the zero position, and relieve the pressure.

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