A certain type of vortex axis engine oil leakage failure analysis research

A certain type of vortex axis engine oil 2019 - fault analysis research 12 - 28 Deng Haiyong into wide art as now China abstract: a type of vortex axis engine oil gas generator unit cell problems in use are common, due to the structure characteristics of the return pipe determines the field change return pipe gaskets, o-rings, gaskets have great difficulty, maintenance manual and no relevant maintenance procedures, past the fault to the machine back to plant troubleshooting, cycle is long, serious impact on the user's attendance. In the field under the condition of workstation is not complete and crude ruled out the fault without reference, through field troubleshooting plant simulation test, prove the feasibility of this field to eliminate the fault. Helps to reduce engine removal rate, and improve the user pipe. Key words: vortex axis engine; Gas generator; The oil; Simulation experiment 1 introduction after the training, xx helicopter engine nacelle floor have more oil, further find oil source, found that the gas generator unit body and free combination of the turbine unit body and lubricating oil leakage. In the use of the oil gas generator unit cell failure are common, often only after we try to replace the bearing into the tubing connector type O ring and gasket and convex platform copper pad, if the fault has not ruled out, after is convex platform copper pad or after sealing ring of bearing return pipe components and bearing graphite gasket seal bad, because bearing structure after, can't change back to the in situ tubing convex platform copper pad or graphite gaskets. In a certain type of vortex axis engine maintenance manual without access to relevant operating procedures, field troubleshooting when only by experience, is not very standard. In order to solve this problem, by plant simulation field troubleshooting, demonstration field replacement return pipe copper pad or graphite gasket, convex of engine lubricating oil pressure, vibration, etc. The influence of the performance, test verification, the result is good. After 2 gas generator bearing structure and the failure mechanism of 2. 1 gas generator gas generator bearing structure after three bearing mounting holes, respectively installed oil in the oil, oil return and ventilation short tube, between each spool and bearing mounting holes through the convex platform copper gasket seal, external catheter with a short pipe between a pipe joint, between the short tube and pipe joint through the gasket to seal, o-rings, as shown in figure 1. 2. 2 oil gas generator fault mechanism after seal components with screw after installed on the front end surface bearing components, bearing components installed after edge to bolt on the bearing pedestals. Bearing components face before and after sealing YanHuan between mating surface with flexible graphite plate gasket seal oil. After according to the gas generator and the structure of the bearing, resulting in leakage of gas turbine generator and freedom in combination with surface oil bearing seat after fault are mainly into the tubing between the convex platform copper pad and bearing seat, bearing seat after return pipe copper pad between the bearing and not convex seal, and the bearing components face before and after sealing YanHuan components between the mating surface of flexible graphite plate gasket seal, engine work, after bearing the lubricating oil through the clearance between the leak or lubricating oil from the bearing components face before and after sealing YanHuan components matching surface between the joint surface leakage. 3 outfield eliminate oil leakage fault simulation test 3. 1 choose an engine simulation test scheme, through two simulated field conditions, remove the motor reducer, free turbine and exhaust section, then the axial compressor and gas generator as a whole from the attachment unit cell to be removed, as shown in figure 2. , in turn, remove the three piece after 5, short tube 2, shielding ring sealing YanHuan components, remove the bearing seat, the replacement of flexible graphite gasket, aprons, etc. , after loading the engine, the commissioning according to commissioning procedure, check the engine oil pressure, vibration, admit performance, check the sealing of the engine and calculate the oil consumption. Compare the engine performance. 3. 2 after install and commissioning situation after the replacement of gas generator bearing oil, oil, and vent the copper pad, convex seal, o-rings and after sealing YanHuan component and flexible graphite plate gasket between the bearing seat, bearing seat after loading, in turn axial compressor and gas generator ( As a whole) , free turbine and exhaust segment, speed reducer is installed on the attachment unit cell, fitted with high-energy ignition and external piping, cables, thermocouple, etc accessories. Engine, after loading test according to test procedure, test twice time respectively h31min 1 and 2 h, focusing on the gas turbine generator and freedom combined with no lubricating oil leakage, whether the engine performance parameters meet the regulations. 3. 3 test results by two field after eliminate gas generator oil bearing fault simulation test, the car engine test to verify the sealing normal, lubricating oil consumption, vibration, and qualified performance meet the requirements. In the outfield ruled out the fault. 4 conclusion according to the structural characteristics of bearing seat after gas generator, and simulated field test, equipped with the necessary specialized equipment and tooling equipment and will change, and in the field after the replacement of gas generator bearing flexible graphite plate gasket, oil inlet and return pipe special seal is feasible. References [ 1] Deng Haiyong Yao Lingge, ShiDaMing. A certain type of vortex axis engine training manual [ M] 。 Zhuzhou: China southern airlines industry ( Group) Co. , LTD. , 2008. ( 2] Deng Haiyong Yao Lingge, ShiDaMing. A certain type of vortex axis engine maintenance manual [ M] 。 Zhuzhou: China southern airlines industry ( Group) Co. , LTD. , 2008. Source: science and wealth, 19, 2018