A fuel supply system for low-speed diesel engine bench test

Abstract

An embodiment of the present application provides an oil supply system for a low-speed diesel engine bench test, which is provided with at least two lubricating oil cabinets, a first oil outlet main pipe, a second oil outlet main pipe, a test run circuit, an oil injection circuit, a lubricating oil cooler, a first diesel engine and a second diesel engine. The lubricating oil cabinets are connected to the first oil outlet main pipe and the second oil outlet main pipe through the first oil outlet valve and the second oil outlet valve of each lubricating oil cabinet, respectively. The test run circuit and the oil injection circuit respectively include two output branches, wherein the first test run output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the first diesel engine, the second test run output branch is connected to the first diesel engine, the first oil injection output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the second diesel engine, and the second oil injection output branch is connected to the second diesel engine. Various components are connected to the test run circuit and the oil injection circuit through pipelines, so as to achieve a mode in which one diesel engine is injected with oil and the other is tested in the same period of time while satisfying multiple oil supply methods.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine manufacturing, in particular to an oil supply system for low-speed diesel engine bench testing. Background Art

[0002] The bench test process of low-speed diesel engines usually covers two core stages: oil injection and test run. This process relies on the auxiliary engine room system to provide necessary energy support, specifically covering four categories: lubricating oil, air, cooling water and electricity. In the oil injection stage, the role of lubricating oil is crucial. First, by heating the lubricating oil to achieve the warm-up effect, it is conducive to the smooth start of the diesel engine; secondly, the lubricating oil can effectively prevent dry friction between the moving parts inside the diesel engine, thereby reducing wear and power consumption; finally, through the oil injection and flushing process of the lubricating oil, impurities in the diesel engine and its pipelines can be removed to ensure the normal operation of the diesel engine. The time consumption in this stage has a decisive influence on the progress of the entire bench test.

[0003] At present, in addition to the conventional oil supply system, low-speed diesel engines have also developed independent crosshead lubrication oil supply or hydraulic oil supply, and during the test run, the intervention of lubricating oil coolers is also required to meet higher performance requirements. However, with the increase in order volume and the improvement of bench utilization, the existing auxiliary machine system cannot achieve the operation mode of two diesel engines in the same period of time, one for oiling and the other for test run, which directly leads to the extension of bench occupancy period and the decline of production efficiency. Summary of the invention

[0004] The main purpose of the embodiment of the present application is to propose a fuel supply system for low-speed diesel engine bench testing, aiming to achieve an operating mode in which two diesel engines are operated in the same period of time, one for fueling and the other for testing, while satisfying multiple fuel supply methods, thereby improving production efficiency.

[0005] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a fuel supply system for a low-speed diesel engine bench test, the system comprising:

[0006] At least two lubricating oil tanks, a first oil outlet main pipe, a second oil outlet main pipe, a test line, an oil injection line, a lubricating oil cooler, a first diesel engine and a second diesel engine;

[0007] Each of the lubricating oil tanks is provided with a first oil outlet valve and a second oil outlet valve, wherein the first oil outlet valve is connected to the first oil outlet main pipe, and the second oil outlet valve is connected to the second oil outlet main pipe;

[0008] The first oil outlet main pipe is connected to the input end of the test circuit, and the second oil outlet main pipe is connected to the input end of the oil injection circuit;

[0009] The lubricating oil cooler is connected to the test circuit;

[0010] The test run circuit is provided with a first test run output branch and a second test run output branch, the first test run output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the first diesel engine, and the second test run output branch is connected to the first diesel engine;

[0011] The oil injection circuit is provided with a first oil injection output branch and a second oil injection output branch, the first oil injection output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the second diesel engine, and the second oil injection output branch is connected to the second diesel engine;

[0012] The first test run output branch is provided with a first boost pump, the second test run output branch is provided with a first machine-side filter, the first oil injection output branch is provided with a second boost pump, and the second oil injection output branch is provided with a second machine-side filter.

[0013] Through the system of the first aspect, it is possible to achieve an operating mode in which one diesel engine is oiled and the other is tested during the same period of time while satisfying the three oil supply forms of conventional oil supply, crosshead lubricating oil supply and hydraulic oil supply. This improves equipment utilization, ensures that both diesel engines can be fully utilized in the best condition, avoids idle waste of resources, helps shorten the overall work process, and improves work efficiency. By alternating oiling and testing, potential problems can be discovered and resolved in a timely manner, providing a strong guarantee for the long-term stable operation of the diesel engine.

[0014] In one possible implementation, the first oil outlet main pipe is connected to the input end of the test circuit through a first lubricating oil pump and a first magnetic filter, and the second oil outlet main pipe is connected to the input end of the oil injection circuit through a second lubricating oil pump and a second magnetic filter.

[0015] In a possible implementation, the first lubricating oil pump, the first magnetic filter, the second lubricating oil pump, and the second magnetic filter are further connected to an I-shaped pipe, and the I-shaped pipe includes:

[0016] Lower pipe, upper pipe and middle pipe;

[0017] The lower end pipeline is provided with a first valve and a second valve, connected to the second lubricating oil pump and the first lubricating oil pump;

[0018] The upper end pipeline is provided with a third valve and a fourth valve, which are connected to the second magnetic filter and the first magnetic filter;

[0019] The intermediate pipeline is provided with a third lubricating oil pump and a third magnetic filter, and is connected with the first valve, the second valve, the third valve and the fourth valve.

[0020] In one possible implementation, a cross pipe is connected between the second test run output branch and the second oil injection output branch, and the cross pipe includes a fifth valve and a sixth valve, the input end of the fifth valve is arranged at the second oil injection output branch, the output end of the fifth valve is arranged at the second test run output branch, the input end of the sixth valve is arranged at the second test run output branch, and the output end of the sixth valve is arranged at the second oil injection output branch.

[0021] In one possible implementation, the second test run output branch also includes a seventh valve, and the second oil injection output branch also includes an eighth valve, the seventh valve is connected to the output end of the fifth valve and the input end of the sixth valve, and the eighth valve is connected to the input end of the fifth valve and the output end of the sixth valve.

[0022] In a possible implementation manner, input ends of the seventh valve and the sixth valve are connected to a first fine filter, and input ends of the fifth valve and the eighth valve are connected to a second fine filter.

[0023] In a possible implementation, the system further includes a first oil return main pipe and a second oil return main pipe, and the first diesel engine and the second diesel engine are connected to each of the lubricating oil tanks through the first oil return main pipe and the second oil return main pipe, respectively.

[0024] In a possible implementation, a ninth valve and a tenth valve are respectively provided on the first oil return main pipe and the second oil return main pipe, and are connected to the lubricating oil tanks.

[0025] In one possible implementation, the first test run output branch is further provided with a first check valve and an eleventh valve, the first check valve is connected to the output end of the first boost pump, and the eleventh valve is connected to the input end of the first boost pump; the second test run output branch is further provided with a twelfth valve, connected to the output end of the first machine-side filter; the first oil injection output branch is further provided with a second check valve, connected to the output end of the second boost pump; the second oil injection output branch is further provided with a thirteenth valve, connected to the output end of the second machine-side filter.

[0026] In one possible implementation, the eleventh valve includes two input branches of the eleventh valve, and the input branches of the two eleventh valves are respectively provided with a fourteenth valve and a fifteenth valve, and the second boost pump includes two input branches of the second boost pumps, and the input branches of the two second boost pumps are respectively provided with a sixteenth valve and a seventeenth valve.

[0027] It can be seen from the technical solutions provided by one or more embodiments of the present specification that the oil supply system for bench testing of low-speed diesel engines provided in the embodiments of the present application is provided by setting at least two lubricating oil cabinets, a first oil outlet main pipe, a second oil outlet main pipe, a test line, an oil injection line, a lubricating oil cooler, a first diesel engine and a second diesel engine, and connected to the first oil outlet main pipe and the second oil outlet main pipe through the first oil outlet valve and the second oil outlet valve of each lubricating oil cabinet respectively, the test line and the oil injection line respectively include two output branches, wherein the first test output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the first diesel engine, the second test output branch is connected to the first diesel engine, the first oil injection output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the second diesel engine, and the second oil injection output branch is connected to the second diesel engine, and each component is connected to the test line and the oil injection line through pipelines, so as to achieve an operating mode in which one diesel engine is injected with oil and the other is tested in the same period of time while satisfying multiple oil supply methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate one or more embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the description of one or more embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a structural schematic diagram of a fuel supply system for a low-speed diesel engine bench test provided in an embodiment of the present application.

[0030] Reference numerals: first lubricating oil tank 1, second lubricating oil tank 2, third lubricating oil tank 3, second oil outlet valve 4 of first lubricating oil tank, first oil outlet valve 5 of first lubricating oil tank, first oil outlet valve 6 of second lubricating oil tank, second oil outlet valve 7 of second lubricating oil tank, second oil outlet valve 8 of third lubricating oil tank, first oil outlet valve 9 of third lubricating oil tank, first valve 10, second valve 11, second lubricating oil pump 12, third lubricating oil pump 13, first lubricating oil pump 14, second magnetic filter 15, third magnetic filter 16, first magnetic filter 17, third valve 18, fourth valve 19, temperature control valve 20, lubricating oil cooler 21, second fine filter 22, first fine filter 23, sixteenth valve 24, seventeenth valve 25, fourteenth valve 26, fifteenth valve 27, eleventh valve 28 , the second boost pump 29, the first boost pump 30, the second check valve 31, the first check valve 32, the eighth valve 33, the fifth valve 34, the sixth valve 35, the seventh valve 36, the second engine-side filter 37, the first engine-side filter 38, the eighteenth valve 39, the thirteenth valve 40, the nineteenth valve 41, the twelfth valve 42, the ninth valve 43, the tenth valve 44, the first lubricating oil tank inlet valve 45, the third lubricating oil tank inlet valve 46, the first diesel engine 47, the second diesel engine 48, the third diesel engine 49, the fourth diesel engine 50, the oil injection line 51, the test line 52, the crosshead lubricating oil pipe or hydraulic oil pipe 53 of the first diesel engine, the crosshead lubricating oil pipe or hydraulic oil pipe 54 of the second diesel engine, the first oil return main pipe 55, and the second oil return main pipe 56. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below in conjunction with the drawings in one or more embodiments of this specification. Obviously, the one or more embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on one or more embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0032] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0034] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0035] First, as Figure 1 As shown, a fuel supply system for a low-speed diesel engine bench test is provided, the system comprising:

[0036] At least two lubricating oil tanks, a first oil outlet main pipe, a second oil outlet main pipe, a test line 52, an oil injection line 51, a lubricating oil cooler 21, a first diesel engine 47 and a second diesel engine 48; each of the lubricating oil tanks is provided with a first oil outlet valve and a second oil outlet valve, the first oil outlet valve is connected to the first oil outlet main pipe, and the second oil outlet valve is connected to the second oil outlet main pipe; the first oil outlet main pipe is connected to the input end of the test line 52, and the second oil outlet main pipe is connected to the input end of the oil injection line 51; the lubricating oil cooler 21 is connected to the test line 52; the test line 52 is provided with a first test output branch and a second test output branch, the first test output The outlet branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe 53 of the first diesel engine, and the second test run output branch is connected to the first diesel engine 47; the oil injection circuit 51 is provided with a first oil injection output branch and a second oil injection output branch, the first oil injection output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe 54 of the second diesel engine, and the second oil injection output branch is connected to the second diesel engine 48; the first test run output branch is provided with a first boost pump 30, and the second test run output branch is provided with a first machine-side filter 38, the first oil injection output branch is provided with a second boost pump 29, and the second oil injection output branch is provided with a second machine-side filter 37.

[0037] It should be noted that in a diesel engine or other mechanical equipment, oil injection is intended to ensure that the lubrication system and cooling system of the equipment can work properly. By injecting an appropriate amount of lubricating oil into the equipment, it is possible to check whether these systems have problems such as leakage and blockage. The test run is the process of conducting a preliminary operation test on the equipment. During the test run phase, the equipment will operate under conditions close to the actual working conditions to verify its performance, safety and reliability. Through the test run, the operating status of the equipment can be observed, and various parameters can be checked to see whether they meet the design requirements. Abnormal conditions can be discovered and handled in a timely manner. This process helps to ensure that the equipment can remain stable and efficient when it is officially used, and avoid production interruptions caused by failures or damage. The present application sets at least two lubricating oil cabinets, a first oil outlet main pipe, a second oil outlet main pipe, a test run line 52, an oil injection line 51, a lubricating oil cooler 21, a first diesel engine 47 and a second diesel engine 48 in the system, so that two diesel engines can be operated in the same period of time, one for oil injection and the other for test run, which can save time and improve overall work efficiency. Compared with oiling and testing each diesel engine separately, simultaneous operation can complete the testing of all equipment faster, thus shortening the project cycle. During the test process, existing equipment and resources can be fully utilized to reduce duplication and waste. In addition, by testing two diesel engines at the same time, the performance and stability of the equipment can be more comprehensively evaluated, providing a reference for subsequent maintenance and optimization. In addition, during the test process, the operating conditions and data differences of the two devices can be observed, so as to more accurately evaluate the performance and reliability of the equipment. If one of the devices has a problem, the other device can be used as a backup or reference, providing strong support for troubleshooting and repair.

[0038] Among them, in some embodiments, a crosshead lubricating oil pipe or a hydraulic oil pipe is also provided in the first diesel engine 47 and the second diesel engine 48 to meet the three oil supply forms of conventional oil supply, crosshead lubricating oil supply and hydraulic oil supply. The multi-form oil supply system can ensure that key components such as crosshead bearings are fully lubricated. Through a reasonable oil pipe layout and oil supply method, the lubricating oil or hydraulic oil can be accurately delivered to the parts that need lubrication to form a stable oil film and reduce friction and wear. Among them, the hydraulic oil is pressurized by a separate channel from the lubricating oil, which not only improves the operating efficiency of the equipment, but also extends the service life of the equipment.

[0039] Through the system of the first aspect, it is possible to achieve an operating mode in which one diesel engine is oiled and the other is tested during the same period of time while satisfying the three oil supply forms of conventional oil supply, crosshead lubricating oil supply and hydraulic oil supply. This improves equipment utilization, ensures that both diesel engines can be fully utilized in the best condition, avoids idle waste of resources, helps shorten the overall work process, and improves work efficiency. By alternating oiling and testing, potential problems can be discovered and resolved in a timely manner, providing a strong guarantee for the long-term stable operation of the diesel engine.

[0040] In one possible implementation, the first oil outlet main pipe is connected to the input end of the test line 52 through the first lubricating oil pump 14 and the first magnetic filter 17, and the second oil outlet main pipe is connected to the input end of the oil injection line 51 through the second lubricating oil pump 12 and the second magnetic filter 15.

[0041] It should be noted that the first lubricating oil pump 14 and the second lubricating oil pump 12 are responsible for extracting the lubricating oil from the oil pan or oil tank and delivering it to the parts that need lubrication, such as bearings, gears, etc., to ensure that these parts can be fully lubricated during operation, thereby reducing friction and wear and extending the service life of the equipment. At the same time, the lubricating oil pump also undertakes the task of recycling the used lubricating oil to the oil tank to complete the recycling of the lubricating oil. The first magnetic filter 17 and the second magnetic filter 15 are purification equipment that utilizes the principle of magnetic separation, and are mainly used to remove iron or magnetic particles from the fluid. In the lubricating oil system, the magnetic filter can effectively capture and remove impurities such as iron filings and metal abrasive particles in the lubricating oil, thereby protecting the equipment from wear and blockage caused by these impurities. By maintaining the cleanliness of the lubricating oil, the magnetic filter helps to improve the operating efficiency of the equipment and reduce the possibility of failure. In addition, the magnetic filter also has the characteristics of easy maintenance and maintenance. By regularly cleaning or replacing the filter element, its long-term stable operation and efficient iron removal effect can be ensured. By arranging a lubricating oil pump and a magnetic filter in the system, the lubrication system and the fluid cleanliness of the fuel supply system for the low-speed diesel engine bench test can be maintained, so that the fuel supply system for the low-speed diesel engine bench test can operate stably and for a long time.

[0042] In one possible implementation, the first lubricating oil pump 14, the first magnetic filter 17, the second lubricating oil pump 12, and the second magnetic filter 15 are also connected to an I-shaped pipe, and the I-shaped pipe includes: a lower end pipe, an upper end pipe and an intermediate pipe; the lower end pipe is provided with a first valve 10 and a second valve 11, which are connected to the second lubricating oil pump 12 and the first lubricating oil pump 14; the upper end pipe is provided with a third valve 18 and a fourth valve 19, which are connected to the second magnetic filter 15 and the first magnetic filter 17; the intermediate pipe is provided with a third lubricating oil pump 13 and a third magnetic filter 16, which are connected to the first valve 10, the second valve 11, the third valve 18 and the fourth valve 19.

[0043] In some embodiments, the I-shaped pipeline is a spare pipeline, which provides an additional oil supply path for the diesel engine fuel supply system. When the main fuel supply pipeline fails, such as blockage, leakage or breakage, the spare pipeline can quickly take over the fuel supply task to ensure that the lubricating oil can be continuously and stably supplied to the diesel engine, thereby avoiding the diesel engine from shutting down due to fuel supply interruption. Secondly, the spare pipeline also plays a role in balancing the system pressure. In the diesel engine fuel supply system, the flow of lubricating oil will generate a certain pressure. If the system pressure is too high, it may cause damage to components such as the fuel supply pipeline. The existence of the spare pipeline can disperse and relieve the system pressure to a certain extent and protect the fuel supply system from the impact of high pressure. In a complex operating environment, the diesel engine may face various emergencies, such as lubricating oil pollution, pipeline aging, etc. The existence of the spare pipeline provides more options and guarantees for dealing with these emergencies. Once there is a problem with the main fuel supply pipeline, the spare pipeline can be put into use immediately to ensure the normal operation of the diesel engine and avoid safety accidents caused by fuel supply failure. The I-shaped spare pipeline not only provides an additional oil supply path for the diesel engine, ensuring a continuous and stable supply of lubricating oil, but also plays a role in balancing the system pressure and improving operational reliability and safety.

[0044] In one possible implementation, a cross pipe is connected between the second test run output branch and the second oil injection output branch, and the cross pipe includes a fifth valve 34 and a sixth valve 35, the input end of the fifth valve 34 is arranged at the second oil injection output branch, the output end of the fifth valve 34 is arranged at the second test run output branch, the input end of the sixth valve 35 is arranged at the second test run output branch, and the output end of the sixth valve 35 is arranged at the second oil injection output branch.

[0045] In one possible implementation, the second test run output branch also includes a seventh valve 36, and the second oil injection output branch also includes an eighth valve 33. The seventh valve 36 is connected to the output end of the fifth valve 34 and the input end of the sixth valve 35, and the eighth valve 33 is connected to the input end of the fifth valve 34 and the output end of the sixth valve 35.

[0046] It should be noted that, by arranging the seventh valve 36, the eighth valve 33, the cross pipe and the fifth valve 34 and the sixth valve 35 on the cross pipe on the second test output branch and the second oil injection output branch, the opening and closing states of each valve can be precisely controlled to achieve an operating mode in which two diesel engines are operated in the same period, one for oil injection and the other for test injection. The lubricating oil supply can be flexibly adjusted according to the oil injection and test injection needs to meet the requirements of different oil injection and test injection stages, thereby improving the flexibility and working efficiency of the system.

[0047] It should also be noted that valve control helps protect diesel engines. During the test run or oiling process, if the lubricating oil is supplied too much or too little, it may cause damage to the diesel engine. By controlling the valve, the supply of lubricating oil can be monitored and controlled in real time to avoid problems such as engine overheating and detonation caused by insufficient or excessive lubricating oil supply. In addition, by controlling the valve, bubbles and zero residual pressure in the system can be prevented, and the vibration and emission level of the diesel engine can be reduced, thereby extending the service life of the diesel engine. In addition, by controlling the valve, the supply of lubricating oil can be controlled, which can reduce unnecessary lubricating oil consumption and emissions, which not only helps to reduce the operating cost of the diesel engine, but also helps to ensure that the diesel engine meets emission standards and promotes the sustainable development of diesel engines.

[0048] In a possible implementation, the input ends of the seventh valve 36 and the sixth valve 35 are connected to the first fine filter 23 , and the input ends of the fifth valve 34 and the eighth valve 33 are connected to the second fine filter 22 .

[0049] It should be noted that the main function of the first fine filter 23 and the second fine filter 22 in the oil supply system is to serve as the main filter in the system to finely filter the impurities in the lubricating oil to ensure the purity and quality of the lubricating oil. In addition, the fine filter can also effectively filter out fine solid particle impurities in the lubricating oil, which may include metal particles, dust and other pollutants generated by wear. The fine filter can significantly reduce the risk of these impurities entering the engine combustion chamber through its high-precision filtering effect, thereby protecting the engine from damage caused by wear and blockage. In addition, while ensuring high filtering efficiency, the fine filter must also maintain a small flow resistance to ensure reliable operation and sufficient power output of the engine. The fine filter plays a key filtering and purification role in the oil supply system for low-speed diesel engine bench testing, improving the stability of the system and the reliability of long-term operation.

[0050] In a possible implementation, the system further includes a first oil return main pipe 55 and a second oil return main pipe 56, and the first diesel engine 47 and the second diesel engine 48 are connected to each of the lubricating oil tanks via the first oil return main pipe 55 and the second oil return main pipe 56, respectively.

[0051] It should be noted that, during the operation of the low-speed diesel engine, not all the supplied lubricating oil will be consumed, and some lubricating oil will be used as residual lubricating oil. In order to effectively utilize the residual lubricating oil and reduce the overall fuel consumption of the diesel engine, a first oil return main pipe 55 and a second oil return main pipe 56 are provided. The main function of these two main pipes is to collect the unused lubricating oil and safely guide it back to the corresponding lubricating oil tank, which not only improves the utilization rate of the lubricating oil and reduces unnecessary waste, but also has a positive impact on the economy and environmental protection performance of the diesel engine. In addition, when the lubricating oil system pressure of the diesel engine rises to an excessively high level for some reason, it may cause damage to the sealing of the system, the oil pipe, the oil pump and other components. The oil return main pipe is used to allow the excess lubricating oil to flow back to the lubricating oil tank under pressure to effectively adjust the system pressure. When the lubricating oil pressure of the system is too high, the excess lubricating oil will flow back to each lubricating oil tank through the oil return main pipe, thereby maintaining the stability of the system pressure, ensuring that the diesel engine can still operate stably under complex and changeable working conditions, and maintaining the overall stability of the system.

[0052] In a possible implementation, a ninth valve 43 and a tenth valve 44 are respectively provided on the first oil return main pipe 55 and the second oil return main pipe 56 , and are connected to the lubricating oil tanks.

[0053] It should be noted that a valve is set between the oil return main pipe and each lubricating oil tank. When the pressure of the oil supply system for the low-speed diesel engine bench test is too high, the valve can be opened to allow excess lubricating oil to flow back to the lubricating oil tank, thereby preventing problems such as oil pipe rupture, seal damage and oil pump overload. This helps to protect the safety of the oil supply system and extend its service life. At the same time, the opening and closing of the valve can control the amount of lubricating oil flowing back, which helps to maintain the normal operation and performance of the diesel engine.

[0054] In one possible implementation, the first test run output branch is further provided with a first check valve 32 and an eleventh valve 28, the first check valve 32 is connected to the output end of the first boost pump 30, and the eleventh valve 28 is connected to the input end of the first boost pump 30; the second test run output branch is further provided with a twelfth valve 42, which is connected to the output end of the first engine-bypass filter 38; the first oil injection output branch is further provided with a second check valve 31, which is connected to the output end of the second boost pump 29; the second oil injection output branch is further provided with a thirteenth valve 40, which is connected to the output end of the second engine-bypass filter 37.

[0055] It should be noted that the first check valve 32 and the second check valve 31 are used to control the unidirectional flow of the fluid and can automatically detect the flow direction of the lubricating oil. When the check valve detects the backflow of the lubricating oil, the valve is quickly closed to block the backflow path of the lubricating oil and prevent the backflow of the lubricating oil. The setting of the check valve avoids the problem that when the lubricating oil flows back to the lubricating oil tank or the low-pressure area along the original path, the pressure of the system drops rapidly, the lubricating oil leaks and is contaminated, and even affects the start-up and operation of the diesel engine. In addition, the check valve also has the characteristics of simple structure and strong durability. It is usually composed of components such as a piston, a spring and a sealing gasket, and can maintain long-term stable performance in a harsh working environment. Therefore, the maintenance and replacement of the check valve are also relatively simple, which further reduces the maintenance cost and downtime of the diesel engine.

[0056] In one possible implementation, the eleventh valve 28 includes two input branches of the eleventh valve 28, and the input branches of the two eleventh valves 28 are respectively provided with a fourteenth valve 26 and a fifteenth valve 27, and the second boost pump 29 includes two input branches of the second boost pumps 29, and the input branches of the two second boost pumps 29 are respectively provided with a sixteenth valve 24 and a seventeenth valve 25.

[0057] It should be noted that, by setting the fourteenth valve 26, the fifteenth valve 27, the sixteenth valve 24 and the seventeenth valve 25, the configuration of these valves can enable the user to accurately control the opening and closing states of each valve according to actual needs, so as to achieve an operating mode in which two diesel engines are oiled and the other is tested in the same period of time by controlling the switching of the valves. The ability to regulate the supply of lubricating oil is greatly improved. According to the specific needs of oiling and testing, the distribution and supply of lubricating oil can be flexibly adjusted to meet the requirements of different oiling and testing stages, thereby improving the flexibility and working efficiency of the system.

[0058] like Figure 1 As shown, the present invention is further described below by taking two diesel engines being tested and fueled simultaneously as an example.

[0059] In some embodiments, when the working mode is: the first diesel engine 47 is tested and the second diesel engine 48 is refueled: the second oil outlet valve 4 of the first lubricating oil tank, the first oil outlet valve 6 of the second lubricating oil tank, the second oil outlet valve 7 of the second lubricating oil tank, the first oil outlet valve 9 of the third lubricating oil tank, the first valve 10, the second valve 11, the third valve 18, the fourth valve 19, the seventeenth valve 25, the fifteenth valve 27, the fifth valve 34 and the sixth valve 35 are closed, and the remaining valves are opened.

[0060] The process of the test run of the first diesel engine 47 is as follows: the oil of the first lubricating oil tank 1 flows out from the first oil outlet valve 5 of the first lubricating oil tank, passes through the first lubricating oil pump 14 and the first magnetic filter 17, and if the temperature of the oil is high, it reaches the lubricating oil cooler 21 through the temperature control valve 20, and reaches the first fine filter 23 after cooling, and is divided into a first test run output branch and a second test run output branch to enter the first diesel engine 47; the first test run output branch is: entering the first diesel engine 47 through the fourteenth valve 26, the eleventh valve 28, the first boost pump 30, the first check valve 32 and the crosshead lubricating oil pipe or hydraulic oil pipe 53 of the first diesel engine, and the second test run output branch is: entering the first diesel engine 47 after passing through the seventh valve 36, the first engine side filter 38 and the twelfth valve 42, and providing oil for the test run of the first diesel engine 47, and the lubricating oil is returned to the first lubricating oil tank 1 through the first oil return main pipe 55 and the ninth valve 43 after being merged with the first diesel engine 47.

[0061] The process of oiling the second diesel engine 48 is as follows: the oil of the third lubricating oil tank 3 flows out from the second oil outlet valve 8 of the third lubricating oil tank, passes through the second lubricating oil pump 12, the second magnetic filter 15, and the second fine filter 22, and is divided into a first oil output branch and a second oil output branch to enter the second diesel engine 48; the first oil output branch passes through the sixteenth valve 24, the second boost pump 29, the second check valve 31, and the crosshead lubricating oil pipe or hydraulic oil pipe 54 of the second diesel engine to enter the second diesel engine 48; the second oil output branch passes through the eighth valve 33, the second engine-side filter 37, and the thirteenth valve 40 to enter the second diesel engine 48 for oiling the second diesel engine 48, and the lubricating oil is returned to the third lubricating oil tank 3 through the second oil return main pipe 56 and the tenth valve 44 after being merged with the second diesel engine 48.

[0062] In some embodiments, when the working mode is: the second diesel engine 48 is tested and the third diesel engine 49 is refueled: the first oil outlet valve 5 of the first lubricating oil tank, the first oil outlet valve 6 of the second lubricating oil tank, the second oil outlet valve 7 of the second lubricating oil tank, the second oil outlet valve 8 of the third lubricating oil tank, the first valve 10, the second valve 11, the third valve 18, the fourth valve 19, the sixteenth valve 24, the fourteenth valve 26, the eighth valve 33 and the seventh valve 36 are closed, and the remaining valves are opened.

[0063] The process of the test run of the second diesel engine 48 is as follows: the oil of the third lubricating oil tank 3 flows out from the first oil outlet valve 9 of the third lubricating oil tank, passes through the first lubricating oil pump 14 and the first magnetic filter 17, and if the temperature of the oil is high, it reaches the lubricating oil cooler 21 through the temperature control valve 20, and reaches the first fine filter 23 after being cooled, and enters the second diesel engine 48 through the seventeenth valve 25, the second boost pump 29, the second check valve 31 and the sixth valve 35, the second engine-side filter 37, and the thirteenth valve 40 two-way pipeline connected in parallel, to provide oil for the test run of the second diesel engine 48, and the oil returns to the third lubricating oil tank 3 through the second oil return main pipe 56 and the tenth valve 44 after being merged with the second diesel engine 48.

[0064] The process of oiling the third diesel engine 49 is as follows: the oil of the first lubricating oil tank 1 flows out from the second oil outlet valve 4 of the first lubricating oil tank, passes through the second lubricating oil pump 12, the second magnetic filter 15, the second fine filter 22, and enters the third diesel engine 49 through the fifteenth valve 27, the eleventh valve 28, the first boosting pump 30, the first check valve 32 and the fifth valve 34, the first engine-side filter 38, and the twelfth valve 42 two-way pipeline in parallel, so as to supply oil to the third diesel engine 49, and the oil returns to the first lubricating oil tank 1 through the first oil return main pipe 55 and the ninth valve 43 after being merged with the third diesel engine 49.

[0065] It can be seen from the technical solutions provided by one or more embodiments of the present specification that the fuel supply system for low-speed diesel engine bench testing provided in the embodiments of the present application can achieve the three fuel supply forms of conventional fuel supply, crosshead lubricating oil supply and hydraulic fuel supply by precisely controlling the opening and closing states of each valve according to actual needs. At the same time, it can realize an operating mode in which one diesel engine is fueled and the other is tested in the same period of time. This improves equipment utilization, ensures that both diesel engines can be fully utilized in the best condition, avoids idle waste of resources, helps shorten the overall work process, and improves work efficiency. By alternating fueling and testing, potential problems can be discovered and solved in a timely manner, providing a strong guarantee for the long-term stable operation of the diesel engine.

[0066] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0067] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0068] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0069] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0070] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0071] The above description is only the preferred implementation mode of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fuel supply system for low-speed diesel engine bench testing, characterized in that: The system comprises: at least two lubricating oil cabinets, a first oil outlet main pipe, a second oil outlet main pipe, a test line, an oil injection line, a lubricating oil cooler, a first diesel engine and a second diesel engine; Each of the lubricating oil tanks is provided with a first oil outlet valve and a second oil outlet valve, wherein the first oil outlet valve is connected to the first oil outlet main pipe, and the second oil outlet valve is connected to the second oil outlet main pipe; The first oil outlet main pipe is connected to the input end of the test circuit, and the second oil outlet main pipe is connected to the input end of the oil injection circuit; The lubricating oil cooler is connected to the test circuit; The test run circuit is provided with a first test run output branch and a second test run output branch, the first test run output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the first diesel engine, and the second test run output branch is connected to the first diesel engine; The oil injection circuit is provided with a first oil injection output branch and a second oil injection output branch, the first oil injection output branch is connected to the crosshead lubricating oil pipe or hydraulic oil pipe of the second diesel engine, and the second oil injection output branch is connected to the second diesel engine; The first test run output branch is provided with a first booster pump, the second test run output branch is provided with a first engine-side filter, the first oil injection output branch is provided with a second booster pump, and the second oil injection output branch is provided with a second engine-side filter; A cross pipe is connected between the second test run output branch and the second oil injection output branch, the cross pipe comprises a fifth valve and a sixth valve, the input end of the fifth valve is arranged at the second oil injection output branch, the output end of the fifth valve is arranged at the second test run output branch, the input end of the sixth valve is arranged at the second test run output branch, and the output end of the sixth valve is arranged at the second oil injection output branch; The second test run output branch also includes a seventh valve, and the second oil injection output branch also includes an eighth valve. The seventh valve is connected to the output end of the fifth valve and the input end of the sixth valve, and the eighth valve is connected to the input end of the fifth valve and the output end of the sixth valve.

2. The system according to claim 1, characterized in that The first oil outlet main pipe is connected to the input end of the test circuit through a first lubricating oil pump and a first magnetic filter, and the second oil outlet main pipe is connected to the input end of the oil injection circuit through a second lubricating oil pump and a second magnetic filter.

3. The system according to claim 2, characterized in that The first lubricating oil pump, the first magnetic filter, the second lubricating oil pump, and the second magnetic filter are also connected to an I-shaped pipeline, and the I-shaped pipeline includes: Lower pipe, upper pipe and middle pipe; The lower end pipeline is provided with a first valve and a second valve, connected to the second lubricating oil pump and the first lubricating oil pump; The upper end pipeline is provided with a third valve and a fourth valve, which are connected to the second magnetic filter and the first magnetic filter; The intermediate pipeline is provided with a third lubricating oil pump and a third magnetic filter, and is connected with the first valve, the second valve, the third valve and the fourth valve.

4. The system according to claim 1, characterized in that The input ends of the seventh valve and the sixth valve are connected to the first fine filter, and the input ends of the fifth valve and the eighth valve are connected to the second fine filter.

5. The system according to claim 1, characterized in that The system further comprises a first oil return main pipe and a second oil return main pipe, and the first diesel engine and the second diesel engine are connected to the lubricating oil tanks through the first oil return main pipe and the second oil return main pipe, respectively.

6. The system according to claim 5, characterized in that The first oil return main pipe and the second oil return main pipe are respectively provided with a ninth valve and a tenth valve, which are connected to the lubricating oil tanks.

7. The system according to claim 1, characterized in that The first test run output branch is also provided with a first check valve and an eleventh valve, the first check valve is connected to the output end of the first boost pump, and the eleventh valve is connected to the input end of the first boost pump; the second test run output branch is also provided with a twelfth valve, which is connected to the output end of the first machine-side filter; the first oil injection output branch is also provided with a second check valve, which is connected to the output end of the second boost pump; the second oil injection output branch is also provided with a thirteenth valve, which is connected to the output end of the second machine-side filter.

8. The system according to claim 7, characterized in that The eleventh valve includes two input branches of the eleventh valve, and the input branches of the two eleventh valves are respectively provided with a fourteenth valve and a fifteenth valve. The second boost pump includes two input branches of the second boost pumps, and the input branches of the two second boost pumps are respectively provided with a sixteenth valve and a seventeenth valve.

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