CN-119578105-B - Method and device for predicting service life of rotating part of diesel supercharger

CN119578105BCN 119578105 BCN119578105 BCN 119578105BCN-119578105-B

Abstract

The present disclosure relates to the technical field of locomotive diesel engine equipment, and more particularly to a method and apparatus for predicting the life of a supercharger rotating member of a diesel engine, the method comprising obtaining a first remaining life of the supercharger rotating member calculated according to a turbine inlet temperature according to a first formula; obtaining a second residual service life of the rotating part of the supercharger according to the second formula, obtaining a third residual service life of the rotating part of the supercharger according to the engine oil inlet pressure of the supercharger according to a third formula, and obtaining the residual service life of the rotating part of the supercharger according to a fourth formula. The method for predicting the service life of the rotating part of the supercharger of the diesel engine can predict the service life of the rotating part of the supercharger in real time, and can maintain and overhaul the supercharger in time, so that the failure rate and the failure influence of the rotating part of the supercharger are reduced, the safety of the diesel engine is improved, and the operation and maintenance cost is reduced.

Inventors

ZHANG CHAOYI
XING YU
WANG HONGFENG
MENG HAO
Liu Shengxirui
DUAN ZIYI

Assignees

中车大连机车车辆有限公司
大连中车柴油机有限公司

Dates

Publication Date: 20260505
Application Date: 20241129

Claims (8)

1. A method of predicting the life of a rotating member of a diesel supercharger, comprising: obtaining a first remaining service life of a supercharger rotating member calculated according to a supercharger turbine inlet temperature according to a first formula, wherein the first formula comprises that ty1 = t-t1-tx1 and tx 1= (t/n 1) m1; obtaining a second remaining service life of the supercharger rotating member calculated according to a supercharger rotation speed according to a second formula, wherein the second formula comprises ty2 = t-t2-tx2 and tx 2= (t/n 2) m2; obtaining a third remaining service life of the supercharger rotating member calculated according to a supercharger engine oil inlet pressure according to a third formula, wherein the third formula comprises ty3 = t-t3-tx3 and tx 3= (t/n 3) m3; Based on the first remaining service life, the second remaining service life, and the third remaining service life, and according to a fourth formula, the fourth formula includes: Wherein: ty1 is a first remaining service life, t is a theoretical service life of the rotating part of the supercharger in a normal state, t1 is a service time of the rotating part of the supercharger in a normal state of turbine inlet temperature of the supercharger, tx1 is a folded service time of the rotating part of the supercharger in a high state of turbine inlet temperature of the supercharger, n1 is a theoretical service life of the rotating part of the supercharger in a high state of turbine inlet temperature of the supercharger, and m1 is a service time of the rotating part of the supercharger in a high state of turbine inlet temperature of the supercharger; ty2 is a second remaining service life, t2 is a service time of the rotating part of the supercharger in a normal supercharger rotating speed state, tx2 is a folding service time of the rotating part of the supercharger in a high supercharger rotating speed state, n2 is a theoretical service life of the rotating part of the supercharger in the high supercharger rotating speed state, and m2 is a service time of the rotating part of the supercharger in the high supercharger rotating speed state; ty3 is a third remaining service life, a service time of the supercharger rotating member in a t3 normal supercharger engine oil inlet pressure state, a folded service time of the supercharger rotating member in a tx3 low supercharger engine oil inlet pressure state, n3 is a theoretical service life of the supercharger rotating member in a low supercharger engine oil inlet pressure state, and m3 is a service time of the supercharger rotating member in a low supercharger engine oil inlet pressure state; ty is the residual service life of the rotating part of the supercharger, w1 is the weighting coefficient of the influence of the turbine inlet temperature of the supercharger on the service life, w2 is the weighting coefficient of the influence of the rotating speed of the supercharger on the service life, and w3 is the weighting coefficient of the influence of the engine oil inlet pressure of the supercharger on the service life; The judging conditions of the normal state comprise that the turbine inlet temperature T of the supercharger is smaller than T1, the rotating speed N of the supercharger is smaller than N1, and the engine oil inlet pressure P of the supercharger is larger than P1; the normal supercharger turbine inlet temperature state judging condition comprises that the supercharger turbine inlet temperature T is less than T1; the high supercharger turbine inlet temperature state judging condition comprises that the supercharger turbine inlet temperature T is more than T1 and less than T2; The normal supercharger speed state judging condition comprises that the supercharger speed N is smaller than N1; The high supercharger speed state judging condition comprises that the supercharger speed N is larger than N1 and smaller than N2; the normal supercharger oil inlet pressure state judging condition comprises that the supercharger oil inlet pressure P is larger than P1; The low supercharger oil inlet pressure state judgment condition comprises that the supercharger oil inlet pressure P is smaller than P1 and larger than P2; Wherein, T1 is the normal threshold of the inlet temperature of the turbine of the supercharger, N1 is the normal threshold of the rotation speed of the supercharger, P1 is the normal threshold of the inlet pressure of engine oil of the supercharger, T2 is the high threshold of the inlet temperature of the turbine of the supercharger, N2 is the high threshold of the rotation speed of the supercharger, P2 is the low threshold of the inlet pressure of the engine oil of the supercharger, and T1 is less than T2, N1 is less than N2, and P1 is more than P2; the weighting factor of the turbocharger turbine inlet temperature effect on the service life is w1=n1/(n1+n2+n3), The weighting factor of the influence of the supercharger speed on the service life is w2=n2/(n1+n2+n3), The weighting factor of the influence of the supercharger oil inlet pressure on the service life is w3=n3/(n1+n2+n3).
2. The method of claim 1, wherein the theoretical life t of the supercharger rotating member in a normal state is obtained by a first test method comprising: And in the state that the turbine inlet temperature T of the supercharger is lower than T1 and the engine oil inlet pressure P of the supercharger is higher than P1, circularly changing the rotation speed N of the supercharger within the range of 0-N1, and acquiring the duration from the beginning of a first test to the failure of the rotating part of the supercharger as the theoretical service life T of the rotating part of the supercharger in a normal state.
3. The method of claim 1, wherein the theoretical supercharger rotating life n1 at high supercharger turbine inlet temperatures is obtained by a second test method comprising: And in the state that the rotation speed N of the supercharger is lower than N1 and the engine oil inlet pressure P of the supercharger is higher than P1, enabling the turbine inlet temperature T of the supercharger to circularly change within the range of T1-T2, and acquiring the duration from the beginning of the second test to the failure of the rotating part of the supercharger as the theoretical service life N1 of the rotating part of the supercharger under the high turbine inlet temperature state.
4. The method for predicting the life of a rotating supercharger rotating member of a diesel engine according to claim 1, wherein the theoretical service life n2 of the rotating supercharger rotating member in the high supercharger rotation speed state is obtained by a third test method comprising: and in the state that the turbine inlet temperature T of the supercharger is lower than T1 and the engine oil inlet pressure P of the supercharger is higher than P1, circularly changing the rotation speed N of the supercharger within the range of N1-N2, and acquiring the duration from the start of a third test to the failure of the rotating part of the supercharger as the theoretical service life N2 of the rotating part of the supercharger under the high rotation speed state of the supercharger.
5. The method of claim 1, wherein the theoretical lifetime of the supercharger rotating member at low supercharger oil inlet pressure is obtained by a fourth test method comprising: And (3) in the state that the turbine inlet temperature T of the supercharger is lower than T1 and the rotation speed of the supercharger is lower than N1, circularly changing the engine oil inlet pressure of the supercharger within the range of P1-P2, and obtaining the duration from the start of a fourth test to the failure of the rotating part of the supercharger, namely the theoretical service life N3 of the rotating part of the supercharger under the state of low engine oil inlet pressure of the supercharger.
6. The device for predicting the service life of the rotating part of the diesel engine supercharger is characterized by comprising a data acquisition unit and a data analysis processing unit, wherein the data acquisition unit is used for acquiring operation data of the supercharger and transmitting the acquired operation data to the data analysis processing unit, system software is designed in the data analysis processing unit, a two-stage threshold analysis processing mechanism, an analysis and statistics function of the acquired data and a prediction function of the residual service life of the rotating part of the supercharger are designed in the system software, the first stage is a normal temperature threshold T1 of a turbine inlet of the supercharger, a normal rotating speed threshold N1 of the supercharger, a normal pressure threshold P1 of engine oil of the supercharger, the second stage is a high temperature threshold T2 of the turbine inlet of the supercharger, a high rotating speed threshold N2 of the supercharger and a low pressure threshold P2 of the engine oil of the supercharger, and the data analysis processing unit obtains the residual service life of the rotating part of the supercharger through calculation according to the operation data by adopting the method as set forth in any one of claims 1 to 5, and the operation data comprises the turbine inlet temperature T of the supercharger, the rotating speed N of the supercharger and the engine oil inlet pressure of the supercharger.
7. The apparatus for predicting the life of a rotating member of a supercharger of a diesel engine according to claim 6, wherein the data acquisition unit comprises a turbine inlet temperature sensor, a supercharger rotation speed sensor and a supercharger oil inlet pressure sensor for acquiring a supercharger turbine inlet temperature T, a supercharger rotation speed T and a supercharger oil inlet pressure P, respectively.
8. The apparatus for predicting life of a turbocharger rotating member of a diesel engine according to claim 6, further comprising a display unit connected to said data analysis processing unit for displaying the remaining life of the turbocharger rotating member calculated by said data analysis processing unit.

Description

Method and device for predicting service life of rotating part of diesel supercharger Technical Field The disclosure relates to the technical field of locomotive diesel engine equipment, in particular to a method and a device for predicting service life of a rotating part of a diesel supercharger. Background The superchargers of locomotive diesel engines are divided into radial-flow type and axial-flow type structures, and the superchargers of the two structures comprise rotating parts which serve as core components of the superchargers to directly influence the performance and service lives of the superchargers. The supercharger is installed on the tail end pipeline of the diesel engine exhaust system, and the energy of exhaust gas discharged from the diesel engine cylinder is used for driving a rotating part in the supercharger to rotate, so that air is compressed and then used for combustion in the cylinder. The working environment of the diesel engine supercharger, especially the internal rotating part, is very bad, and the supercharger bears the impact of high temperature and high pressure air flow in the working process, and also bears high frequency vibration and centrifugal reaction force creep under the effect of high-speed rotation. During the operation of the locomotive diesel engine, the traction working condition is frequently changed due to the change of the line and the environmental condition, and the supercharger rotating member is subjected to the fatigue creep influence caused by temperature alternation, rotation speed alternation, vibration alternation and the like. The supercharger rotation member is provided with a regulation on its working condition and its service life in terms of pattern design, material selection, heat treatment and manufacturing. In the practical application process, the maintenance mode of the rotating part of the supercharger of the locomotive diesel engine is maintenance after the fault occurs (such as damage of the rotating part by foreign matters, high-temperature burn of the rotating part due to oil interruption and the like) and update according to the normal maintenance process of the locomotive (namely a certain application time or operation mileage). The actual working conditions of the rotating member are not monitored and regulated, and the actual working time of the rotating member is not truly counted, so that the application reliability of the rotating member of the supercharger cannot be accurately and effectively ensured, and the service life of the rotating member of the supercharger cannot be estimated in real time. The failure of the rotating part of the supercharger can cause the problems of the combustion chamber sweeping, engine oil leakage, gas leakage and the like of the supercharger, the performance exertion of a diesel engine is directly affected, and great potential safety hazards exist. Light weight can lead to power reduction or shutdown of the diesel engine, and heavy weight can lead to fire accidents. Because the rotating part of the supercharger belongs to a precise part in the supercharger, the rotating part of the supercharger is simultaneously subjected to the external application conditions and the self-quality, the application state of the rotating part of the supercharger is not effectively monitored at present, the application reliability of the rotating part of the supercharger cannot be ensured, the hidden danger of faults cannot be early warned in advance for maintenance, and the influence of the faults is reduced. At present, a planned maintenance mode updated according to a normal maintenance procedure has certain inaccuracy, and the operating state of a supercharger rotating part cannot be truly reflected, so that the accurate operation and maintenance, cost control, reliable operation and the like of the diesel engine are very bottleneck. Accordingly, the prior art is in need of improvement. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a method and a device for predicting the service life of a rotating part of a supercharger of a diesel engine, which realize the prediction of the service life of the rotating part of the supercharger, reduce the failure rate and the failure influence of the rotating part of the supercharger, and further improve the availability and the operation and maintenance cost of the diesel engine. In order to solve the technical problems, the invention adopts the following technical scheme: according to one aspect of the present invention, there is provided a method of life prediction of a supercharger rotating member of a diesel engine, comprising: Obtaining a first remaining service life of the supercharger rotating member calculated according to a supercharger turbine inlet temperature according to a first formula, wherein the first formula comprises that ty1 = t-t1-tx1 and tx 1= (t/n 1) m1; Obtaining a second residual service life of the super