Diesel engine lubricating system and flushing method

Abstract

The application provides a diesel engine lubricating system and a flushing method, the system comprising: a temperature sensor arranged in an oil tank, used for obtaining a current flushing temperature of the diesel engine lubricating system; a flushing pump connected between the oil tank and the diesel engine; a flow meter connected with a flow regulating valve, used for obtaining a current flushing flow of the diesel engine lubricating system; and a controller, used for obtaining a target flushing flow according to an inner diameter of a pipeline, a maximum operating Reynolds number and the current flushing temperature, and controlling the flow regulating valve to adjust the current flushing flow to the target flushing flow. The application obtains the maximum operating Reynolds number of the diesel engine at the highest power, and ensures that the Reynolds number value in the flushing process is not less than the maximum operating Reynolds number value, so that the flushing condition in the flushing process of the lubricating oil pipeline in the diesel engine is deduced reversely, the lubricating oil pipeline in the diesel engine is flushed under the flushing condition, and the flushing quality in the whole flushing process is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel engine lubricating system, in particular to a diesel engine lubricating system and a flushing method. BACKGROUND

[0002] Lubricating oil systems are widely used in various industrial machinery, such as engines, compressors, turbines, gearboxes, and bearings. They are one of the key factors to ensure the efficient and reliable operation of these devices. Lubricating oil systems are not just simple oil supply mechanisms, but are designed to optimize machine performance, extend equipment life, and reduce maintenance costs. For example, large diesel generator sets are high-speed rotating mechanical equipment, and their bearings, gears, and pistons require a large amount of oil for lubrication and cooling, especially in the friction parts of the dynamic and static combination of the unit. Any interruption of oil supply, even for a short time, will cause serious damage to the equipment.

[0003] The lubricating oil system is equivalent to the blood of the diesel engine, and is the most important auxiliary system of the diesel engine, so its cleanliness level requirement is the highest. The closed-loop circulation flushing of the diesel engine lubricating oil pipeline is an important link in the pipeline construction process, which aims to remove mechanical impurities or other impurities generated during pipeline welding to achieve the cleanliness required during normal operation of the diesel engine and prevent wear of diesel engine crankshaft bushings, camshaft bushings, cylinder sleeves, gear transmission mechanisms, etc. At present, the flushing system is usually composed of an electric gear pump, a circulating lubricating oil tank, a filter and an auxiliary pipeline, and the system is connected to the internal lubricating oil pipeline of the diesel engine to circulate and flush the internal lubricating oil pipeline of the diesel engine. During the flushing process, it is not convenient to adjust the flushing conditions, and the flushing quality is low. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a complete patent name to solve the problem of "in the flushing process, it is not convenient to adjust the flushing conditions, and the flushing quality is low" in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the present application provides a diesel engine lubricating system, characterized by comprising:

[0006] A lubricating oil tank for storing lubricating oil;

[0007] A temperature sensor arranged in the lubricating oil tank for obtaining the current flushing temperature of the diesel engine lubricating system;

[0008] A heater for heating the lubricating oil in the lubricating oil tank;

[0009] A flushing pump connected between the lubricating oil tank and the diesel engine;

[0010] A flow regulating valve connected between the oil tank and the diesel engine;

[0011] A flow meter connected to the flow regulating valve, for obtaining a current flushing flow of the lubricating system of the diesel engine;

[0012] A controller, for obtaining a target flushing flow according to a pipe inner diameter, a maximum operating Reynolds number and the current flushing temperature, and controlling the flow regulating valve to regulate the current flushing flow to the target flushing flow;

[0013] The controller is further configured to obtain a target flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing flow, and control the heater to regulate the current flushing temperature to the target flushing temperature.

[0014] The pipe inner diameter is used to represent an inner diameter of a lubricating oil pipe located inside the diesel engine.

[0015] In an embodiment of the present application, the controller is configured to obtain the maximum operating Reynolds number according to the following steps:

[0016] When the diesel engine is operating at the highest power, obtaining an operating temperature of the lubricating oil by the temperature sensor, and obtaining an average operating flow rate of the lubricating oil in the lubricating oil pipe located inside the diesel engine by the flow rate meter;

[0017] Determining a first kinematic viscosity according to the operating temperature;

[0018] Calculating a product of the average operating flow rate and the pipe inner diameter, and dividing the product by the first kinematic viscosity to obtain the maximum operating Reynolds number.

[0019] In an embodiment of the present application, the controller is configured to calculate the target flushing flow according to the following steps:

[0020] Determining a second kinematic viscosity according to the current flushing temperature;

[0021] Determining a pipe cross-sectional area according to the pipe inner diameter;

[0022] Calculating a product of the second kinematic viscosity, the maximum operating Reynolds number and the pipe cross-sectional area;

[0023] Calculating a ratio of the product to the pipe inner diameter to obtain the target flushing flow.

[0024] In an embodiment of the present application, the controller is configured to calculate the target flushing temperature according to the following steps:

[0025] Determining a pipe cross-sectional area according to the pipe inner diameter;

[0026] calculating a product of the current flushing flow rate and the pipe inner diameter as a first product;

[0027] calculating a product of the maximum operating Reynolds number and the pipe cross-sectional area as a second product;

[0028] calculating a ratio of the first product and the second product to obtain a third kinematic viscosity;

[0029] determining a target flushing temperature according to the third kinematic viscosity.

[0030] In an embodiment of the present application, the diesel engine lubricating system further comprises a filter connected between the oil tank and the diesel engine, for filtering lubricating oil flowing back to the oil tank from the lubricating oil pipe inside the diesel engine.

[0031] In an embodiment of the present application, the heater is provided in plurality, and the plurality of heaters are uniformly arranged along the side wall of the oil tank.

[0032] In an embodiment of the present application, the diesel engine lubricating system further comprises a liquid level gauge for monitoring the oil level of the lubricating oil in the oil tank.

[0033] In an embodiment of the present application, the controller is further configured to obtain a corresponding flushing flow rate according to the pipe inner diameter, the maximum operating Reynolds number and a preset flushing temperature, and control the heater to adjust the current flushing temperature to the corresponding flushing temperature, and control the flow rate adjusting valve to adjust the current flushing flow rate to the corresponding flushing flow rate.

[0034] In an embodiment of the present application, the controller is further configured to obtain a corresponding flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and a preset flushing flow rate, and control the heater to adjust the current flushing temperature to the preset flushing temperature, and control the flow rate adjusting valve to adjust the current flushing flow rate to the corresponding flushing flow rate.

[0035] The present application further provides a flushing method of a diesel engine lubricating system, the method comprising the following steps:

[0036] obtaining a current flushing temperature and a current flushing flow rate of the diesel engine lubricating system;

[0037] obtaining a target flushing flow rate according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing temperature, and adjusting the current flushing flow rate to the target flushing flow rate, or obtaining a target flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing flow rate, and adjusting the current flushing temperature to the target flushing temperature;

[0038] The pipe inner diameter is used to represent the inner diameter of the lubricating oil pipe inside the diesel engine.

[0039] As described above, the diesel engine lubricating system and flushing method have the following beneficial effects: the controller is used to obtain the target flushing flow according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing temperature, and control the flow regulating valve to adjust the current flushing flow to the target flushing flow; the controller is also used to obtain the target flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing flow, and control the heater to adjust the current flushing temperature to the target flushing temperature. The application obtains the maximum operating Reynolds number of the diesel engine at the highest power, and ensures that the Reynolds number value in the flushing process is not less than the maximum operating Reynolds number value, and the flushing condition in the flushing process of the lubricating oil pipe inside the diesel engine is deduced, and the lubricating oil pipe inside the diesel engine is flushed under the flushing condition, so as to ensure the flushing quality in the whole flushing process. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 The connection principle schematic diagram of the diesel engine lubricating system provided by the embodiment of the application is shown in the figure.

[0041] Figure 2 The minimum flushing flow curve of the lubricating oil in the lubricating oil pipe inside the diesel engine of the diesel engine lubricating system provided by the embodiment of the application at different temperatures is shown in the figure.

[0042] Figure 3 The flowchart of the flushing method of the diesel engine lubricating system provided by the embodiment of the application is shown in the figure.

[0043] In the figure:

[0044] 10-oil tank, 20-heater, 30-flushing pump, 40-flow regulating valve, 50-flow meter, 60-filter. DETAILED DESCRIPTION

[0045] The embodiments of the application are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the application from the disclosure of the specification. The application can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0046] It is to be noted that the drawings provided in the following embodiments only schematically illustrate the basic concepts of the present application, and only the components related to the present application are shown in the drawings, rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, number and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type can also be more complex.

[0047] In the following description, a large number of details are discussed in order to provide a more thorough explanation of embodiments of the application, however, it will be apparent to those skilled in the art that the embodiments of the application can be implemented without these specific details, and in other embodiments, well-known structures and devices are shown in block diagram form rather than in detail in order to avoid obscuring the embodiments of the application.

[0048] In the embodiments of the present application, the diesel engine is a diesel engine of a nuclear power plant, and the diesel engine lubricating system is used to provide lubrication for parts of the diesel engine, thereby reducing friction and wear during operation of the diesel engine. Meanwhile, the diesel engine lubricating system has a function of flushing the lubricating oil pipeline inside the diesel engine, by providing a flushing medium (lubricating oil) to remove residual metal chips, oil sludge or other contaminants inside the system, to ensure that newly added lubricating oil during subsequent actual operation of the diesel engine can work in a clean environment.

[0049] Referring to the drawings Figures 1-2 A diesel engine lubricating system according to the first embodiment of the present application is exemplarily described. The diesel engine lubricating system comprises an oil tank 10, a temperature sensor, a heater 20, a flushing pump 30, a flow regulating valve 40, a flow meter 50 and a controller.

[0050] The oil tank 10 is used to store lubricating oil; the temperature sensor is arranged in the oil tank 10 and is used to obtain a current flushing temperature of the diesel engine lubricating system; the heater 20 is used to heat the lubricating oil in the oil tank 10; the flushing pump 30 is connected between the oil tank 10 and the diesel engine lubricating system; the flow regulating valve 40 is connected between the oil tank 10 and the diesel engine lubricating system; the flow meter 50 is connected with the flow regulating valve 40 and is used to obtain a current flushing flow of the diesel engine lubricating system; the controller is used to obtain a target flushing flow according to a pipeline inner diameter, a maximum operating Reynolds number and the current flushing temperature; and control the flow regulating valve 40 to adjust the current flushing flow to the target flushing flow; the controller is also used to obtain a target flushing temperature according to the pipeline inner diameter, the maximum operating Reynolds number and the current flushing flow, and control the heater 20 to adjust the current flushing temperature to the target flushing temperature; wherein the pipeline inner diameter is used to represent the inner diameter of the pipeline inside the diesel engine.

[0051] The lubricating oil tank 10 is a tank for storing flushing medium, and in the embodiment, the flushing medium is lubricating oil. For example, the flushing medium can also be other special cleaning oil, which can be selected by those skilled in the art according to actual conditions.

[0052] In the embodiment, the temperature sensor is arranged in the lubricating oil tank 10, and is used to obtain the current flushing temperature of the diesel engine lubricating system. The diesel engine lubricating system also comprises a liquid level gauge, which is used to monitor the oil level of the lubricating oil in the lubricating oil tank 10, so as to supplement in time when the oil is insufficient.

[0053] In the embodiment, the heater 20 is used to heat the lubricating oil in the lubricating oil tank 10. For example, the heater 20 can be an electric heater 20, which converts electric energy into heat energy through a resistance wire or a heating element, and is used to heat the lubricating oil. For example, the heater 20 can be arranged in multiple numbers, and the multiple heaters 20 are uniformly arranged along the side wall of the lubricating oil tank 10. By arranging multiple heaters 20, it can be ensured that the lubricating oil is heated more uniformly in the entire lubricating oil tank, and at the same time, the overall heating process can be faster and more uniform, and the heating time is shortened.

[0054] In the embodiment, the flushing pump 30 is connected between the lubricating oil tank 10 and the diesel engine, and is used to extract the lubricating oil in the lubricating oil tank 10 and deliver it to the place needing lubrication through a pipeline. The flow regulating valve 40 is connected between the lubricating oil tank 10 and the diesel engine, and specifically, the flow regulating valve 40 is connected with the lubricating oil pipeline inside the diesel engine.

[0055] In the embodiment, the flow meter 50 is connected with the flow regulating valve 40, and is used to obtain the current flushing flow of the diesel engine lubricating system. For example, the flow meter 50 can be installed at the lubricating oil output pipeline of the diesel engine, which is not limited in the application. The flow meter 50 can be an ultrasonic flow meter 50, which has high precision and high stability, and its measurement principle is not affected by factors such as fluid density, temperature, pressure and viscosity, and is suitable for occasions requiring high-precision measurement and special medium.

[0056] In the embodiment, the diesel engine lubricating system also comprises a filter 60, which is connected between the lubricating oil tank 10 and the diesel engine, and is used to filter the lubricating oil flowing back to the lubricating oil tank 10 from the lubricating oil pipeline inside the diesel engine. During the flushing process, the filter 60 can ensure that the lubricating oil flowing back to the lubricating oil tank 10 has been purified, and will not bring pollutants back to the lubricating oil tank 10.

[0057] In the embodiment of the present application, the controller is configured to obtain the target flushing flow rate according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing temperature, and control the flow regulating valve 40 to adjust the current flushing flow rate to the target flushing flow rate. In this embodiment, the temperature of the lubricating oil in the lubricating oil tank 10 does not need to be adjusted, and only the flow regulating valve 40 needs to be controlled to adjust the current flushing flow rate to the target flushing flow rate, so that the temperature of the flushing medium input into the lubricating pipe of the diesel engine remains the current flushing temperature, and the flow rate reaches the target flushing flow rate.

[0058] In the embodiment of the present application, the controller is further configured to obtain the target flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing flow rate, and control the heater 20 to adjust the current flushing temperature to the target flushing temperature. In this embodiment, the current flushing flow rate does not need to be adjusted, and only the heater 20 needs to be controlled to adjust the current flushing temperature to the target flushing temperature, so that the flow rate of the flushing medium input into the lubricating pipe of the diesel engine remains the current flushing flow rate, and the temperature reaches the target flushing temperature.

[0059] In some embodiments, the controller is further configured to obtain the corresponding flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and the preset flushing flow rate, and control the heater 20 to adjust the current flushing temperature to the preset flushing temperature, and control the flow regulating valve 40 to adjust the current flushing flow rate to the corresponding flushing flow rate. In this embodiment, the preset flushing temperature can be configured by the controller; the temperature of the flushing medium input into the lubricating pipe of the diesel engine reaches the preset flushing temperature, and the flow rate reaches the corresponding flushing flow rate.

[0060] In some embodiments, the controller is further configured to obtain the corresponding flushing flow rate according to the pipe inner diameter, the maximum operating Reynolds number and the preset flushing temperature, and control the heater 20 to adjust the current flushing temperature to the preset flushing temperature, and control the flow regulating valve 40 to adjust the current flushing flow rate to the corresponding flushing flow rate. In this embodiment, the preset flushing temperature can be configured by the controller; the temperature of the flushing medium input into the lubricating pipe of the diesel engine reaches the preset flushing temperature, and the flow rate reaches the corresponding flushing flow rate.

[0061] In the present application, referring to Figure 2 The temperature value and the flow rate value of the lubricating oil during flushing can be adjusted according to the "minimum flushing flow rate curve at different temperatures during flushing" at different time points without interruption. For example, in one period, the temperature of the lubricating oil during flushing is a first preset flushing temperature, and the flow rate is a first flushing flow rate corresponding to the first preset flushing temperature (or a value greater than the first flushing flow rate), and in the next period, the temperature is a second preset flushing temperature, and the flow rate is a second flushing flow rate corresponding to the second preset flushing temperature (or a value greater than the second flushing flow rate), and so on.

[0062] The state of the liquid in laminar flow or turbulent flow is measured by Reynolds number. Small Reynolds number means that the viscous force between particles plays a major role in the fluid flow, and the particles flow regularly parallel to the inner wall of the pipeline, showing laminar flow state. Large Reynolds number means that the inertial force plays a major role, and the fluid shows turbulent flow state. Generally, Re<2100 is laminar flow state, Re>4000 is turbulent flow state, and Re=2100-4000 is transition state. For example, refer to the diesel engine factory test report. When the diesel engine runs at 110% Pn power, the temperature of the lubricating oil (model: SAE40) can reach 58°C, and the kinematic viscosity at this temperature is 69.6mm 2 / s, and Re is 4298. Therefore, the maximum operating Reynolds number of the diesel engine during operation is determined to be 4298. During the subsequent flushing process, the Re during the flushing process should be controlled to be not less than 4298 to achieve good flushing effect.

[0063] Specifically, the controller is configured to obtain the maximum operating Reynolds number according to the following steps:

[0064] Step S110: When the diesel engine runs at the highest power, the operating temperature of the lubricating oil is obtained by the temperature sensor, and the average operating flow rate of the lubricating oil in the pipeline inside the diesel engine is obtained by the flowmeter;

[0065] Step S120: Determine the first kinematic viscosity according to the operating temperature;

[0066] Step S130: Calculate the product of the average operating flow rate and the inner diameter of the pipeline, and divide the product by the first kinematic viscosity to obtain the maximum operating Reynolds number.

[0067] In step S110, for example, the highest operating power of the diesel engine is 110% Pn, where Pn is the rated power of the diesel engine. It should be noted that 110% Pn is the maximum power of the diesel engine in nuclear power station, and exceeding this maximum power is a fault operation. It should be noted that when the diesel engine runs at the highest power, the operating temperature and the average operating flow rate are both obtainable constants.

[0068] In step S120, the first kinematic viscosity is determined according to the operating temperature. The functional relationship between the operating temperature and the first kinematic viscosity is lglg(v1+a)=b-c×lgT1; where v1 is the first kinematic viscosity, T1 is the operating temperature, and a, b and c are constants.

[0069] It should be noted that the function relationship between the operating temperature and the first kinematic viscosity is the viscosity-temperature relationship of the oil product, and a, b and c are all oil-related constants. Generally, a is 0.6, and b and c can be calculated by substituting the viscosities of the specific oil product at two temperatures into the equation. According to the viscosities of the lubricating oil at 40°C and 100°C, the constant b is 9.32, and the constant c is 3.61. Then, the kinematic viscosities corresponding to other temperatures are calculated, as shown in Table 2.

[0070] In step S130, the maximum operating Reynolds number is obtained by calculation according to the calculation formula of the Reynolds number. The maximum operating Reynolds number is the maximum Reynolds number value in the operation process of the diesel engine. The calculation formula of the Reynolds number is: wherein Re is the Reynolds number, W is the average flow rate, D is the pipe inner diameter, and v is the kinematic viscosity. Specifically, in this step, the average operating flow rate, the first kinematic viscosity and the pipe inner diameter are substituted into the formula, and the Reynolds number value is obtained as the maximum operating Reynolds number.

[0071] In this application, when the diesel engine is running at the highest power, the lubricating oil pipeline in the diesel engine is normal. First, when the diesel engine is running at the highest power, the pipe inner diameter D is a certain value, and the average flow rate W is a certain value. Then, the lubricating oil temperature when the diesel engine is running at the highest power (the lubricating oil temperature at this time is the highest temperature in the operation process of the diesel engine) is obtained. The value of the kinematic viscosity (which is the minimum kinematic viscosity in the operation process of the diesel engine) can be determined by the relationship between the lubricating oil temperature and the kinematic viscosity. Finally, based on the calculation formula of the Reynolds number, the maximum operating Reynolds number value can be calculated.

[0072] During the operation of the diesel engine, the lubricating system of the diesel engine provides lubricating oil for the lubricating oil pipeline in the diesel engine to lubricate the running diesel engine. It should be noted that the normal flow and lubrication of the lubricating oil in the lubricating oil pipeline in the diesel engine can also be regarded as the process of flushing the pipeline. Therefore, it can be understood that during the process of actually flushing the lubricating oil pipeline in the diesel engine, the Reynolds number should be not less than the maximum operating Reynolds number to ensure that the pipeline can be fully flushed.

[0073] In the embodiment of the present application, the controller is configured to calculate the target flushing flow rate according to the following steps:

[0074] Step S210: determining the second kinematic viscosity according to the current flushing temperature;

[0075] Step S220: determining the pipe cross-sectional area according to the pipe inner diameter;

[0076] Step S230: calculating the product of the second kinematic viscosity, the maximum operating Reynolds number and the pipe cross-sectional area;

[0077] Step S240: calculating a ratio of the product and the pipe inner diameter to obtain the target flushing flow rate.

[0078] In step S210, the functional relationship between the current flushing temperature and the second kinematic viscosity is lglg(v2+a)=b-cxlgT2; where v2 is the second kinematic viscosity, T2 is the current flushing temperature, and a, b and c are constants. The specific values of a, b and c are described above and will not be repeated here.

[0079] In step S220, the calculation relationship between the pipe inner diameter and the pipe cross-sectional area is: Where A is the pipe cross-sectional area, and D is the pipe inner diameter.

[0080] In steps S230-S240, the product of the second kinematic viscosity, the maximum operating Reynolds number and the pipe cross-sectional area is calculated, and the ratio of the product and the pipe inner diameter is calculated to obtain the target flushing flow rate, and the calculation formula is: Where v2 is the second kinematic viscosity, Q t is the target flushing flow rate, D is the pipe inner diameter, Re m is the maximum operating Reynolds number, and A is the pipe cross-sectional area.

[0081] In the embodiments of the present application, the controller is configured to calculate the target flushing temperature according to the following steps:

[0082] Step S310: determining the pipe cross-sectional area according to the pipe inner diameter;

[0083] Step S320: calculating the product of the current flushing flow rate and the pipe inner diameter as a first product;

[0084] Step S330: calculating the product of the maximum operating Reynolds number and the pipe cross-sectional area as a second product;

[0085] Step S340: calculating the ratio of the first product and the second product to obtain a third kinematic viscosity;

[0086] Step S350: determining the target flushing temperature according to the third kinematic viscosity.

[0087] In step S310, the pipe cross-sectional area is determined according to the pipe inner diameter, and the specific calculation method is described above and will not be repeated here.

[0088] In steps S320-S340, the product of the current flushing flow rate and the pipe inner diameter is calculated as a first product, the product of the maximum operating Reynolds number and the pipe cross-sectional area is calculated as a second product, and the ratio of the first product and the second product is calculated to obtain a third kinematic viscosity, and the calculation formula is: Where v3 is the third kinematic viscosity, Q cfor the current flush flow rate, D is the pipe inner diameter, Re m for the maximum operating Reynolds number, A is the pipe cross-sectional area.

[0089] In step S350, the target flush temperature is determined according to the third kinematic viscosity, and the specific calculation method is as described above, and will not be repeated here.

[0090] For example, in Table 1, the maximum operating Reynolds number is 4298, and the specific flush flow rate values corresponding to different flush temperatures are specifically listed in the table.

[0091] Table 1: Chart of specific flush flow rate values corresponding to different flush temperatures

[0092]

[0093]

[0094] Table 2: Chart of kinematic viscosity values corresponding to different temperatures

[0095]

[0096] Referring to Figure 3 The application also provides a flushing method of a diesel engine lubrication system, which comprises the following steps:

[0097] Step S1: obtaining the current flush temperature and the current flush flow rate of the diesel engine lubrication system;

[0098] Step S2: obtaining the target flush flow rate according to the pipe inner diameter, the maximum operating Reynolds number and the current flush temperature, and adjusting the current flush flow rate to the target flush flow rate; or obtaining the target flush temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flush flow rate, and adjusting the current flush temperature to the target flush temperature, wherein the pipe inner diameter is used to represent the inner diameter of the pipe located inside the diesel engine.

[0099] The diesel engine lubrication system and the flushing method have the following beneficial effects: the controller is used to obtain the target flush flow rate according to the pipe inner diameter, the maximum operating Reynolds number and the current flush temperature, and control the flow regulating valve to adjust the current flush flow rate to the target flush flow rate; the controller is also used to obtain the target flush temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flush flow rate, and control the heater to adjust the current flush temperature to the target flush temperature. The application obtains the maximum operating Reynolds number of the diesel engine at the highest power, and ensures that the Reynolds number value in the flushing process is not less than the maximum operating Reynolds number value, and the flushing conditions in the flushing process of the lubricating oil pipe inside the diesel engine are deduced, and the lubricating oil pipe inside the diesel engine is flushed under the flushing conditions, which is used to ensure the flushing quality in the entire flushing process.

[0100] The above embodiments are only illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A diesel lubrication system characterized by, The diesel engine lubrication system comprises: a lubricating oil tank for storing lubricating oil; a temperature sensor arranged in the lubricating oil tank for obtaining a current flushing temperature of the diesel engine lubrication system; a heater for heating the lubricating oil in the lubricating oil tank; a flushing pump connected between the lubricating oil tank and the diesel engine; a flow regulating valve connected between the lubricating oil tank and the diesel engine; a flow meter connected with the flow regulating valve for obtaining a current flushing flow of the diesel engine lubrication system; a controller for obtaining a target flushing flow according to a pipe inner diameter, a maximum operating Reynolds number and the current flushing temperature, and controlling the flow regulating valve to adjust the current flushing flow to the target flushing flow; the controller is further configured to obtain a target flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing flow, and control the heater to adjust the current flushing temperature to the target flushing temperature; wherein the pipe inner diameter is used to represent an inner diameter of a lubricating oil pipe located inside the diesel engine; the controller is configured to obtain the maximum operating Reynolds number according to the following steps: when the diesel engine is operating at the highest power, obtaining an operating temperature of the lubricating oil by the temperature sensor, and obtaining an average operating flow rate of the lubricating oil in the lubricating oil pipe located inside the diesel engine by a flow rate meter; determining a first kinematic viscosity according to the operating temperature; calculating a product of the average operating flow rate and the pipe inner diameter, and dividing the product by the first kinematic viscosity to obtain the maximum operating Reynolds number.

2. The diesel lubrication system of claim 1, wherein, the controller is configured to calculate the target flushing flow according to the following steps: determining a second kinematic viscosity according to the current flushing temperature; determining a pipe cross-sectional area according to the pipe inner diameter; calculating a product of the second kinematic viscosity, the maximum operating Reynolds number and the pipe cross-sectional area; calculating a ratio of the product to the pipe inner diameter to obtain the target flushing flow.

3. The diesel lubrication system of claim 1, wherein, the controller is configured to calculate the target flushing temperature according to the following steps: determining a pipe cross-sectional area according to the pipe inner diameter; calculating a product of the current flushing flow and the pipe inner diameter as a first product; calculating a product of the maximum operating Reynolds number and the pipe cross-sectional area as a second product; calculating a ratio of the first product to the second product to obtain a third kinematic viscosity; determining a target flushing temperature according to the third kinematic viscosity.

4. The diesel lubrication system of claim 1, wherein, The diesel engine lubrication system further comprises a filter connected between the lubricating oil tank and the diesel engine for filtering the lubricating oil flowing back to the lubricating oil tank from the lubricating oil pipe located inside the diesel engine.

5. The diesel lubrication system of claim 1, wherein, The heater is arranged in multiple, and the multiple heaters are uniformly arranged along the side wall of the lubricating oil tank.

6. The diesel lubrication system of claim 1, wherein, The diesel engine lubrication system further comprises a liquid level meter for monitoring an oil level of the lubricating oil in the lubricating oil tank.

7. The diesel lubrication system of claim 1, wherein, The controller is further configured to obtain a corresponding flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and a preset flushing flow, and control the heater to adjust the current flushing temperature to the corresponding flushing temperature, and control the flow regulating valve to adjust the current flushing flow to the preset flushing flow.

8. The diesel lubrication system of claim 1, wherein, The controller is further configured to obtain a corresponding flushing flow rate according to a pipe inner diameter, the maximum operating Reynolds number and a preset flushing temperature, and control the heater to adjust the current flushing temperature to the preset flushing temperature and adjust the current flushing flow rate to the corresponding flushing flow rate through the flow rate adjusting valve.

9. A method of flushing a diesel lubricating system, using a diesel lubricating system as claimed in any one of claims 1 to 8, characterised in that, The flushing method comprises the following steps: obtaining a current flushing temperature and a current flushing flow rate of the diesel engine lubricating system; obtaining a target flushing flow rate according to a pipe inner diameter, a maximum operating Reynolds number and the current flushing temperature, and adjusting the current flushing flow rate to the target flushing flow rate; or obtaining a target flushing temperature according to the pipe inner diameter, the maximum operating Reynolds number and the current flushing flow rate, and adjusting the current flushing temperature to the target flushing temperature. The pipe inner diameter is used to represent an inner diameter of a lubricating oil pipe located inside the diesel engine.

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