Diesel engine lubricating system and flushing method

Abstract

The invention provides a diesel engine lubricating system and a flushing method, and the system comprises a temperature sensor which is arranged in a lubricating oil tank and is used for obtaining the current flushing temperature of the diesel engine lubricating system; the flushing pump is connected between the lubricating oil tank and the diesel engine; the flowmeter is connected with the flow regulating valve and used for obtaining the current flushing flow of the diesel engine lubricating system; the controller is used for obtaining a target flushing flow according to the inner diameter of the pipeline, the maximum running Reynolds number and the current flushing temperature and controlling the flow regulating valve to regulate the current flushing flow to the target flushing flow; according to the method, the maximum running Reynolds number of the diesel engine under the highest power is obtained, it is ensured that the Reynolds value in the washing process is not smaller than the maximum running Reynolds value, the washing condition in the washing process of the lubricating oil pipeline in the diesel engine is reversely deduced, and the lubricating oil pipeline in the diesel engine is washed under the washing condition; the device is used for guaranteeing the flushing quality in the whole flushing process.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine lubrication systems, and in particular to a diesel engine lubrication system and a flushing method. Background Art

[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 equipment. The lubricating oil system is not just a simple oil supply mechanism, it is designed to optimize machine performance, extend equipment life, and reduce maintenance costs. For example, as a high-speed rotating mechanical equipment, large diesel generator sets require a lot of oil for lubrication and cooling of their moving parts such as bearings, gears and pistons, especially in the friction parts of the unit where the unit is combined with the static and dynamic parts and rotates at high speed. Any interruption of oil supply, even for a short time, will cause serious equipment damage.

[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. Therefore, its cleanliness level is required to be the highest. The closed-loop flushing of the diesel engine lubricating oil pipeline is an important link in the pipeline construction process. Its purpose is to remove mechanical impurities or other impurities generated during the pipeline welding process to achieve the cleanliness required for the normal operation of the diesel engine and prevent the wear of diesel engine crankshaft bearings, camshaft bearings, cylinder liners, gear transmission mechanisms and other parts. At present, the flushing system is usually composed of an electric gear pump, a circulating lubricating oil tank, a filter and ancillary pipelines, and the system is connected to the lubricating oil pipeline inside the diesel engine to circulate and flush the lubricating oil pipeline inside the diesel engine. During the flushing process, it is not convenient to adjust the flushing conditions appropriately, and the flushing quality is low. Summary of the invention

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

[0005] In order to achieve the above-mentioned object and other related objects, the present invention provides a diesel engine lubrication system, characterized in that it includes:

[0006] Lubricating oil tank, used to store lubricating oil;

[0007] a temperature sensor, disposed in the lubricating oil tank, for obtaining a current flushing temperature of the diesel engine lubrication system;

[0008] A heater, used 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 lubricating oil tank and the diesel engine;

[0011] A flow meter connected to the flow regulating valve and used to obtain a current flushing flow of the diesel engine lubrication system;

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

[0013] The controller is also used to obtain a target flushing temperature according to the inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing flow rate, and control the heater to adjust the current flushing temperature to the target flushing temperature;

[0014] The pipeline inner diameter is used to characterize the inner diameter of the lubricating oil pipeline located inside the diesel engine.

[0015] In one embodiment of the present invention, the controller is used to obtain the maximum operating Reynolds number according to the following steps:

[0016] When the diesel engine is running 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 lubricating oil pipeline inside the diesel engine is obtained by the flow meter;

[0017] determining a first kinematic viscosity based on the operating temperature;

[0018] The product of the average operating flow rate and the inner diameter of the pipeline is calculated, and the product is divided by the first kinematic viscosity to obtain the maximum operating Reynolds number.

[0019] In one embodiment of the present invention, the controller is used to calculate the target flushing flow rate according to the following steps:

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

[0021] Determine the pipeline cross-sectional area according to the pipeline inner diameter;

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

[0023] The target flushing flow rate is calculated by calculating the ratio of the product to the inner diameter of the pipe.

[0024] In one embodiment of the present invention, the controller is used to calculate the target flushing temperature according to the following steps:

[0025] Determine the pipeline cross-sectional area according to the pipeline inner diameter;

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

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

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

[0029] A target flushing temperature is determined based on the third kinematic viscosity.

[0030] In one embodiment of the present invention, the diesel engine lubrication system further includes a filter, which is connected between the lubricating oil tank and the diesel engine and is used to filter the lubricating oil flowing back to the lubricating oil tank from the lubricating oil pipeline inside the diesel engine.

[0031] In one embodiment of the present invention, the heater is provided in plurality, and the plurality of heaters are evenly arranged along the side wall of the lubricating oil tank.

[0032] In one embodiment of the present invention, the diesel engine lubrication system further comprises a liquid level gauge, and the liquid level gauge is used to monitor the oil level of the lubricating oil in the lubricating oil tank.

[0033] In one embodiment of the present invention, the controller is also used to obtain the corresponding flushing temperature based on the inner diameter of the pipeline, the maximum operating Reynolds number and the preset flushing flow rate, and control the heater to adjust the current flushing temperature to the corresponding flushing temperature, and adjust the current flushing flow rate to the preset flushing flow rate through the flow regulating valve.

[0034] In one embodiment of the present invention, the controller is also used to obtain a corresponding flushing flow rate based on the inner diameter of the pipeline, the maximum operating Reynolds number and a preset flushing temperature, and to control the heater to adjust the current flushing temperature to the preset flushing temperature, and to adjust the current flushing flow rate to the corresponding flushing flow rate through the flow regulating valve.

[0035] The present application also provides a method for flushing a diesel engine lubrication system, the method comprising the following steps:

[0036] Acquire the current flushing temperature and current flushing flow rate of the diesel engine lubrication system;

[0037] Obtaining a target flushing flow rate according to the inner diameter of the pipeline, 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 inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing flow rate, and adjusting the current flushing temperature to the target flushing temperature;

[0038] The pipeline inner diameter is used to characterize the inner diameter of the lubricating oil pipeline located inside the diesel engine.

[0039] As described above, the diesel engine lubrication system and flushing method of the present invention have the following beneficial effects: the controller of the present application is used to obtain the target flushing flow rate according to the inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing temperature, and control the flow regulating valve to adjust the current flushing flow rate to the target flushing flow rate; the controller is also used to obtain the target flushing temperature according to the inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing flow rate, and control the heater to adjust the current flushing temperature to the target flushing temperature. The present application obtains the maximum operating Reynolds number of the diesel engine at the highest power, and ensures that the Reynolds number during the flushing process is not less than the maximum operating Reynolds number, and inversely derives the flushing conditions during the flushing process of the lubricating oil pipeline in the diesel engine. Under the flushing conditions, the lubricating oil pipeline in the diesel engine is flushed to ensure the flushing quality during the entire flushing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the connection principle of a diesel engine lubrication system provided by an embodiment of the present invention;

[0041] Figure 2 A minimum flushing flow rate curve diagram of lubricating oil in a lubricating oil pipeline inside a diesel engine of a diesel engine lubrication system provided by an embodiment of the present invention at different temperatures;

[0042] Figure 3 A schematic flow chart of a method for flushing a diesel engine lubrication system provided by an embodiment of the present invention;

[0043] In the figure:

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

[0045] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0046] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0047] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

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

[0049] See attached Figure 1-2 A diesel engine lubrication system according to the first embodiment of the present application is exemplarily described, and includes a lubricating 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 lubricating oil tank 10 is used to store lubricating oil; a temperature sensor is arranged in the lubricating oil tank 10, and is used to obtain the current flushing temperature of the diesel engine lubrication system; the heater 20 is used to heat the lubricating oil in the lubricating oil tank 10; the flushing pump 30 is connected between the lubricating oil tank 10 and the diesel engine lubrication system; the flow regulating valve 40 is connected between the lubricating oil tank 10 and the diesel engine lubrication system; the flow meter 50 is connected to the flow regulating valve 40, and is used to obtain the current flushing flow of the diesel engine lubrication system; the controller is used to obtain the target flushing flow according to the inner diameter of the pipeline, the 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 the target flushing temperature according to the inner diameter of the pipeline, 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 inner diameter of the pipeline is used to characterize the inner diameter of the pipeline located inside the diesel engine.

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

[0052] In the embodiment of the present application, the temperature sensor is arranged in the lubricating oil tank 10 to obtain the current flushing temperature of the diesel engine lubrication system. The diesel engine lubrication system also includes 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 replenish the oil in time when the oil is insufficient.

[0053] In the embodiment of the present application, 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 electrical energy into thermal energy through a resistance wire or a heating element to heat the lubricating oil. For example, the heater 20 can be set to multiple, and the multiple heaters 20 are evenly arranged along the side wall of the lubricating oil tank 10. By setting up multiple heaters 20, it can be ensured that the lubricating oil is heated more evenly in the entire lubricating oil tank. At the same time, the overall heating process can be made faster and more uniform, shortening the heating time.

[0054] In the embodiment of the present application, the flushing pump 30 is connected between the lubricating oil tank 10 and the diesel engine. The flushing pump 30 is used to extract the lubricating oil in the lubricating oil tank 10 and transport it to the place where lubrication is needed through a pipeline; the flow regulating valve 40 is connected between the lubricating oil tank 10 and the diesel engine, specifically, the flow regulating valve 40 is connected to the lubricating oil pipeline inside the diesel engine.

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

[0056] In the embodiment of the present application, the diesel engine lubrication system further includes 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 from the lubricating oil pipeline inside the diesel engine to the lubricating oil tank 10. 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 contaminants back to the lubricating oil tank 10.

[0057] In the embodiment of the present application, the controller is used to obtain the target flushing flow rate according to the inner diameter of the pipeline, 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, there is no need to adjust the temperature of the lubricating oil in the lubricating oil tank 10, and it is only necessary to control the flow regulating valve 40 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 pipeline in the diesel engine is maintained at 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 also used to obtain the target flushing temperature according to the inner diameter of the pipeline, 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, there is no need to adjust the current flushing flow rate, and it is only necessary to control the heater 20 to adjust the current flushing temperature to the target flushing temperature, so that the flow rate of the flushing medium input into the lubrication pipeline in the diesel engine maintains the current flushing flow rate, and the temperature reaches the target flushing temperature.

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

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

[0061] In this application, see Figure 2 , the temperature value and flow value of the lubricating oil during flushing can be adjusted continuously at different times according to the "minimum flushing flow curve at different temperatures" during the flushing process. For example, in one cycle, the temperature of the lubricating oil during the flushing process is the first preset flushing temperature, and the flow is the first flushing flow corresponding to the first preset flushing temperature (or a value greater than the first flushing flow), in the next cycle, the temperature is the second preset flushing temperature, and the flow is the second flushing flow corresponding to the second preset flushing temperature (or a value greater than the second flushing flow), and so on.

[0062] The Reynolds number is used to measure whether the liquid is in a laminar or turbulent state. A small Reynolds number means that the viscous force between the particles plays a dominant role when the fluid flows, and the particles of the fluid flow regularly parallel to the inner wall of the pipe, showing a laminar flow state. A large Reynolds number means that the inertial force plays a dominant role, and the fluid is in a turbulent flow state. Generally, Reynolds numbers Re < 2100 are laminar states, Re > 4000 are turbulent states, and Re = 2100 ~ 4000 are transitional states. For example, looking at the diesel engine factory test report, when the diesel engine is running at 110% Pn power, the lubricating oil (model: SAE40) temperature can reach up to 58 ° C, and the kinematic viscosity at this temperature is 69.6mm 2 / s, Re is 4298. Therefore, the maximum operating Reynolds number of the diesel engine during operation is determined to be 4298. In the subsequent flushing process, Re should be controlled to be no less than 4298 during the flushing process to achieve a good flushing effect.

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

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

[0065] Step S120: determining a 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 maximum 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 the nuclear power plant, and exceeding the maximum power is considered a faulty operation. It should be noted that when the diesel engine is running at the maximum power, the operating temperature and the average operating flow rate are both obtainable fixed values.

[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(ν 1 +a) = bc × lgT 1 ; where ν 1 is the first kinematic viscosity, T 1 is the operating temperature, a, b and c are constants.

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

[0070] In step S130, the maximum operating Reynolds number is obtained by calculation with reference to the calculation formula of the Reynolds number. The maximum operating Reynolds number is the maximum Reynolds number during the operation of the diesel engine. The calculation formula of the Reynolds number is: Wherein, Re is the Reynolds number, W is the average flow velocity, D is the inner diameter of the pipeline, and v is the kinematic viscosity. Specifically, in this step, the average operating flow velocity, the first kinematic viscosity and the inner diameter of the pipeline are substituted into the formula to obtain the Reynolds number as the maximum operating Reynolds number.

[0071] In the present application, when the diesel engine is running at the highest power, the lubricating oil pipeline inside the diesel engine is normal. First, when the diesel engine is running at the highest power, the inner diameter D of the pipeline 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 is obtained (the lubricating oil temperature at this time is the highest temperature during the operation of the diesel engine). The value of the kinematic viscosity can be determined through the relationship between the lubricating oil temperature and the kinematic viscosity (the kinematic viscosity is the minimum kinematic viscosity during the operation of the diesel engine). Finally, based on the calculation formula of the Reynolds number, the maximum operating Reynolds number can be calculated.

[0072] During the operation of the diesel engine, the diesel engine lubrication system provides lubricating oil to the lubricating oil pipeline inside 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 inside the diesel engine can also be regarded as the process of flushing the pipeline. Therefore, it can be understood that in the process of actually flushing the lubricating oil pipeline inside the diesel engine, the Reynolds number should be ensured to be not less than the maximum operating Reynolds number to ensure that the debris in the pipeline can be fully flushed away.

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

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

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

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

[0077] Step S240: Calculate the ratio of the product to the inner diameter of the pipeline 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(ν 2 +a) = bc × lgT 2 ; where ν 2 is the second kinematic viscosity, T 2 is the current flushing temperature, a, b and c are constants. The specific values ​​of a, b and c refer to the above description and will not be repeated here.

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

[0080] In step S230-step S240, the product of the second kinematic viscosity, the maximum operating Reynolds number and the pipeline cross-sectional area is calculated, and the ratio of the product to the inner diameter of the pipeline is calculated to obtain the target flushing flow rate, and the calculation formula is: Among them, v 2 is the second kinematic viscosity, Q t is the target flushing flow rate, D is the inner diameter of the pipeline, Re is m is the maximum operating Reynolds number, and A is the cross-sectional area of ​​the pipeline.

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

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

[0083] Step S320: Calculate the product of the current flushing flow rate and the inner diameter of the pipeline as the first product;

[0084] Step S330: calculating the product of the maximum operating Reynolds number and the pipeline cross-sectional area as the 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 a target flushing temperature according to the third kinematic viscosity.

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

[0088] In step S320-step S340, the product of the current flushing flow rate and the inner diameter of the pipeline is calculated as the first product, the product of the maximum operating Reynolds number and the cross-sectional area of ​​the pipeline is calculated as the second product, and the ratio of the first product and the second product is calculated to obtain the third kinematic viscosity, and the calculation formula is: Among them, v 3 is the third kinematic viscosity, Q c is the current flushing flow rate, D is the inner diameter of the pipe, Re is m is the maximum operating Reynolds number, and A is the cross-sectional area of ​​the pipeline.

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

[0090] For example, in Table 1, the maximum operating Reynolds number is 4298, and the chart specifically lists the specific flushing flow values ​​corresponding to different flushing temperatures.

[0091] Table 1: Chart of specific flushing flow values ​​at different flushing temperatures

[0092]

[0093]

[0094] Table 2: Graph of kinematic viscosity values ​​at different temperatures

[0095]

[0096] See also Figure 3 The present application also provides a method for flushing a diesel engine lubrication system, the method comprising the following steps:

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

[0098] Step S2: obtaining a target flushing flow rate according to the inner diameter of the pipeline, 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 inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing flow rate, and adjusting the current flushing temperature to the target flushing temperature, wherein the inner diameter of the pipeline is used to characterize the inner diameter of the pipeline located inside the diesel engine.

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

[0100] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A diesel engine lubrication system, characterized in that: include: Lubricating oil tank, used to store lubricating oil; a temperature sensor, disposed in the lubricating oil tank, for obtaining a current flushing temperature of the diesel engine lubrication system; A heater, used 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 to the flow regulating valve and used to obtain a current flushing flow of the diesel engine lubrication system; A controller, used for obtaining a target flushing flow rate according to the inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing temperature, and controlling the flow regulating valve to adjust the current flushing flow rate to the target flushing flow rate; The controller is also used to obtain a target flushing temperature according to the inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing flow rate, and control the heater to adjust the current flushing temperature to the target flushing temperature; The pipeline inner diameter is used to characterize the inner diameter of the lubricating oil pipeline located inside the diesel engine.

2. The diesel engine lubrication system according to claim 1, characterized in that: The controller is used to obtain the maximum operating Reynolds number according to the following steps: When the diesel engine is running 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 lubricating oil pipeline inside the diesel engine is obtained by the flow meter; determining a first kinematic viscosity based on the operating temperature; The product of the average operating flow rate and the inner diameter of the pipeline is calculated, and the product is divided by the first kinematic viscosity to obtain the maximum operating Reynolds number.

3. The diesel engine lubrication system according to claim 1, characterized in that: The controller is used to calculate the target flushing flow rate according to the following steps: determining a second kinematic viscosity according to the current flushing temperature; Determine the pipeline cross-sectional area according to the pipeline inner diameter; Calculating the product of the second kinematic viscosity, the maximum operating Reynolds number, and the pipeline cross-sectional area; The target flushing flow rate is calculated by calculating the ratio of the product to the inner diameter of the pipe.

4. The diesel engine lubrication system according to claim 1, characterized in that: The controller is used to calculate the target flushing temperature according to the following steps: Determine the pipeline cross-sectional area according to the pipeline inner diameter; Calculating the product of the current flushing flow rate and the inner diameter of the pipeline as a first product; Calculating the product of the maximum operating Reynolds number and the pipeline cross-sectional area as a second product; Calculating a ratio of the first product to the second product to obtain a third kinematic viscosity; A target flushing temperature is determined based on the third kinematic viscosity.

5. The diesel engine lubrication system according to claim 1, characterized in that: The diesel engine lubrication system further comprises a filter, which is connected between the lubricating oil tank and the diesel engine and is used for filtering the lubricating oil flowing back to the lubricating oil tank from the lubricating oil pipeline inside the diesel engine.

6. The diesel engine lubrication system according to claim 1, characterized in that: The heaters are provided in plurality, and the plurality of heaters are evenly arranged along the side wall of the lubricating oil tank.

7. The diesel engine lubrication system according to claim 1, characterized in that: The diesel engine lubrication system further comprises a liquid level gauge, which is used to monitor the oil level of the lubricating oil in the lubricating oil tank.

8. The diesel engine lubrication system according to claim 1, characterized in that: The controller is also used to obtain a corresponding flushing temperature based on the inner diameter of the pipeline, the maximum operating Reynolds number and a preset flushing flow rate, and to control the heater to adjust the current flushing temperature to the corresponding flushing temperature, and to adjust the current flushing flow rate to the preset flushing flow rate through the flow regulating valve.

9. The diesel engine lubrication system according to claim 1, characterized in that: The controller is also used to obtain a corresponding flushing flow rate according to the inner diameter of the pipeline, the maximum operating Reynolds number and the preset flushing temperature, and to control the heater to adjust the current flushing temperature to the preset flushing temperature, and to adjust the current flushing flow rate to the corresponding flushing flow rate through the flow regulating valve.

10. A method for flushing a diesel engine lubrication system, characterized in that: The method comprises the following steps: Acquire the current flushing temperature and current flushing flow rate of the diesel engine lubrication system; Obtaining a target flushing flow rate according to the inner diameter of the pipeline, 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 inner diameter of the pipeline, the maximum operating Reynolds number and the current flushing flow rate, and adjusting the current flushing temperature to the target flushing temperature; The pipeline inner diameter is used to characterize the inner diameter of the lubricating oil pipeline located inside the diesel engine.

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