Marine main engine fuel injector repair effect evaluation method

Abstract

The invention relates to a marine main engine fuel injector repair effect evaluation method, which comprises the following steps of: firstly, measuring state parameters of a fault fuel injector, cleaning, disassembling and detecting, removing deposited carbon and impurities in the fuel injector, then repairing the fuel injector, and replacing parts such as a sealing ring, a spring, a gasket and a nozzle which are failed, so as to evaluate the repair effect of the fuel injector. The smoothness and the oil injection performance of the oil injection hole are recovered; and next, through a valve opening pressure test, an injection uniformity test and an atomization performance test, a valve opening pressure factor mu, an injection uniformity factor v and an atomization performance factor tau are calculated respectively, then a repairing effect characteristic parameter lambda of the oil sprayer is calculated, and finally the effect of maintenance work is judged according to the characteristic parameter. The method can scientifically and accurately evaluate the repairing effect of the marine main engine fuel injector, and guarantees the combustion efficiency and operation stability of a main engine.

Description

Technical Field

[0001] The invention belongs to the technical field of ship main engine equipment repair, and in particular relates to a ship main engine injector repair effect evaluation method. Background Art

[0002] With the booming development of global shipping, ship main engines, as the core equipment of ship power systems, are widely used in various types of ships. As an important part of the ship main engine, the injector directly affects the injection efficiency of the fuel and the combustion process of the main engine. Its performance is related to the working efficiency and economy of the main engine. However, the ship main engine injector is in a high temperature, high pressure, and complex marine environment for a long time, and it is easy to have problems such as fuel injection hole blockage, poor atomization, and injection angle deviation, which leads to unstable engine operation, increased fuel consumption, and excessive emissions.

[0003] Repairing the injector is an important means to ensure the recovery of the main engine performance, but the evaluation of the repair effect faces certain technical challenges. Traditional evaluation methods usually rely on manual inspection and empirical judgment. The evaluation results are greatly affected by subjective factors and lack quantitative and standardized evaluation criteria. Therefore, developing a scientific and accurate evaluation method for the repair effect of ship main engine injectors is of great engineering significance for improving the repair quality, extending the service life of equipment, and reducing maintenance costs.

[0004] An efficient and accurate repair effect evaluation method can help engineers and equipment managers to timely understand the repair status of the injector and ensure that its performance is restored to the optimal level, thereby effectively improving the working efficiency of the ship's main engine and reducing the failure rate. The present invention provides a repair effect evaluation method for a ship's main engine injector, which can scientifically and effectively evaluate the repair effect of the injector and provide guarantee for the operation of the ship's main engine. Summary of the invention

[0005] The present invention is a method for evaluating the repair effect of a ship main engine injector, which is used for evaluating the repair effect of a ship main engine injector, and specifically comprises the following steps:

[0006] Step 1: Measure the status parameters of the faulty fuel injector, clean and disassemble it to remove the carbon deposits and impurities inside the fuel injector, then repair the fuel injector, replace the failed sealing ring, spring, gasket, nozzle and other parts, and restore the patency of its fuel injection hole and fuel injection performance;

[0007] Step 2: Calculate the injector repair effect characteristic parameter λ

[0008] 1) Calculate the valve opening pressure factor μ

[0009] The repaired ship main engine injector is tested for valve opening pressure, and the correction coefficient C is defined as shown in the following formula (1):

[0010]

[0011] In formula (1), p1 is the valve opening pressure before the injector is repaired, and p2 is the valve opening pressure after the injector is repaired;

[0012] The valve opening pressure factor μ can be calculated by the following formula (2):

[0013]

[0014] 2) Calculate the injection uniformity factor ν

[0015] The injection uniformity test is carried out on the repaired ship main engine injector. The injection uniformity factor ν can be calculated by the following formula (3):

[0016]

[0017] Where σ1 is the standard deviation of the oil trace area of ​​each nozzle hole before the injector is repaired, and σ2 is the standard deviation of the oil trace area of ​​each nozzle hole measured under the same calibration conditions after the injector is repaired;

[0018] 3) Calculate the atomization performance factor τ

[0019] The atomization performance test of the repaired ship main engine injector is carried out, and the atomization performance factor τ can be calculated by the following formula (4):

[0020]

[0021] Where θ1 is the spray cone angle before the injector is repaired, and θ2 is the spray cone angle measured under the same calibration conditions after the injector is repaired;

[0022] 4) Calculate the injector repair effect characteristic parameter λ

[0023] The repair effect characteristic parameter λ can be calculated by the following formula (5):

[0024]

[0025] Step 3: Evaluate the injector repair effect based on the characteristic parameter λ

[0026] If λ≤e, the repair effect is excellent, and the injector performance parameters are significantly improved through the repair work and reach the optimal state;

[0027] If e<λ≤2e, the repair effect is acceptable, and the injector performance parameters are effectively improved through the repair work and reach a usable state;

[0028] If λ>2e, the repair effect is poor, and the injector performance parameters cannot be effectively improved through the repair work, and further repair is required.

[0029] The beneficial effects of the present invention are:

[0030] 1) By combining various performance test indicators before and after the injector repair for quantitative evaluation, the repair effect of the injector can be evaluated scientifically and accurately, avoiding the subjective judgment errors in traditional methods.

[0031] 2) The present invention adopts a multi-dimensional and multi-factor evaluation model, which avoids the one-sidedness of a single indicator and takes into account the coupling effect between multiple factors, making the evaluation of the repair effect of the ship main engine injector more comprehensive.

[0032] 3) The evaluation method provided by the present invention has strong adaptability and can be customized according to the parameter test conditions of different types of ship main engines, and has broad application prospects and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The invention relates to a flow chart of a method for evaluating the repair effect of a ship main engine injector. DETAILED DESCRIPTION

[0034] Step 1: Measure the status parameters of the faulty fuel injector, clean and disassemble it to remove the carbon deposits and impurities inside the fuel injector, then repair the fuel injector, replace the failed sealing ring, spring, gasket, nozzle and other parts, and restore the patency of its fuel injection hole and fuel injection performance;

[0035] Step 2: Calculate the injector repair effect characteristic parameter λ

[0036] 1) Calculate the valve opening pressure factor μ

[0037] The repaired ship main engine injector is tested for valve opening pressure, and the correction coefficient C is defined as shown in the following formula (1):

[0038]

[0039] In formula (1), p1 is the valve opening pressure before the injector is repaired, and p2 is the valve opening pressure after the injector is repaired;

[0040] The valve opening pressure factor μ can be calculated by the following formula (2):

[0041]

[0042] 2) Calculate the injection uniformity factor ν

[0043] The injection uniformity test is carried out on the repaired ship main engine injector. The injection uniformity factor v can be calculated by the following formula (3):

[0044]

[0045] Where σ1 is the standard deviation of the oil trace area of ​​each nozzle hole before the injector is repaired, and σ2 is the standard deviation of the oil trace area of ​​each nozzle hole measured under the same calibration conditions after the injector is repaired;

[0046] 3) Calculate the atomization performance factor τ

[0047] The atomization performance test of the repaired ship main engine injector is carried out, and the atomization performance factor τ can be calculated by the following formula (4):

[0048]

[0049] Where θ1 is the spray cone angle before the injector is repaired, and θ2 is the spray cone angle measured under the same calibration conditions after the injector is repaired;

[0050] 4) Calculate the injector repair effect characteristic parameter λ

[0051] The repair effect characteristic parameter λ can be calculated by the following formula (5):

[0052]

[0053] Step 3: Evaluate the injector repair effect based on the characteristic parameter λ

[0054] If λ≤e, the repair effect is excellent, and the injector performance parameters are significantly improved through the repair work and reach the optimal state;

[0055] If e<λ≤2e, the repair effect is acceptable, and the injector performance parameters are effectively improved through the repair work and reach a usable state;

[0056] If λ>2e, the repair effect is poor, and the injector performance parameters cannot be effectively improved through the repair work, and further repair is required.

Claims

1. A method for evaluating the repair effect of a ship main engine injector, characterized in that: The following steps are involved: Step 1: Measure the status parameters of the faulty fuel injector, clean and disassemble it to remove the carbon deposits and impurities inside the fuel injector, then repair the fuel injector, replace the failed sealing ring, spring, gasket, nozzle and other parts, and restore the patency of its fuel injection hole and fuel injection performance; Step 2: Calculate the injector repair effect characteristic parameter λ 1) Calculate the valve opening pressure factor μ The repaired ship main engine injector is tested for valve opening pressure, and the correction coefficient C is defined as shown in the following formula (1): In formula (1), p1 is the valve opening pressure before the injector is repaired, and p2 is the valve opening pressure after the injector is repaired; The valve opening pressure factor μ can be calculated by the following formula (2): 2) Calculate the injection uniformity factor v The injection uniformity test is carried out on the repaired ship main engine injector. The injection uniformity factor v can be calculated by the following formula (3): Where σ1 is the standard deviation of the oil trace area of ​​each nozzle hole before the injector is repaired, and σ2 is the standard deviation of the oil trace area of ​​each nozzle hole measured under the same calibration conditions after the injector is repaired; 3) Calculate the atomization performance factor τ The atomization performance test of the repaired ship main engine injector is carried out, and the atomization performance factor τ can be calculated by the following formula (4): Where θ1 is the spray cone angle before the injector is repaired, and θ2 is the spray cone angle measured under the same calibration conditions after the injector is repaired; 4) Calculate the injector repair effect characteristic parameter λ The repair effect characteristic parameter λ can be calculated by the following formula (5): Step 3: Evaluate the injector repair effect based on the characteristic parameter λ If λ≤e, the repair effect is excellent, and the injector performance parameters are significantly improved through the repair work and reach the optimal state; If e<λ≤2e, the repair effect is acceptable, and the injector performance parameters are effectively improved through the repair work and reach a usable state; If λ>2e, the repair effect is poor, and the injector performance parameters cannot be effectively improved through the repair work, and further repair is required.

Images